Repository: whitequark/ipaddr.js (js)
Issue: Some IPv4 Mapped IPv6 Addresses don't parse
The following calls throw exceptions:

ipaddr.IPv6.parse("FFFF::255.255.255.255")
throw :
Error: ipaddr: the address has neither IPv6 nor IPv4 format

but
ipaddr.IPv6.parser("FFFF::0:255.255.255.255") is ok!


![QQ图片20231007143751](https://github.com/whitequark/ipaddr.js/assets/7478660/d0443f6f-4b0f-40d4-a7fc-7cf0cc07dffc)


I'm using version 2.1.0


Pull request description: fix parsing of some IPv4-embedded IPv6 adresses
fixes #171

Added tests for the specific address from the issue as well as a NAT64 address.

Patch:
diff --git a/ipaddr.min.js b/ipaddr.min.js
index 510d6ad..f380fa6 100644
--- a/ipaddr.min.js
+++ b/ipaddr.min.js
@@ -1,1 +1,1 @@
-!function(t){!function(t){"use strict";const r="(0?\\d+|0x[a-f0-9]+)",e={fourOctet:new RegExp(`^${r}\\.${r}\\.${r}\\.${r}$`,"i"),threeOctet:new RegExp(`^${r}\\.${r}\\.${r}$`,"i"),twoOctet:new RegExp(`^${r}\\.${r}$`,"i"),longValue:new RegExp(`^${r}$`,"i")},n=new RegExp("^0[0-7]+$","i"),i=new RegExp("^0x[a-f0-9]+$","i"),o="(?:[0-9a-f]+::?)+",s={zoneIndex:new RegExp("%[0-9a-z]{1,}","i"),native:new RegExp(`^(::)?(${o})?([0-9a-f]+)?(::)?(%[0-9a-z]{1,})?$`,"i"),deprecatedTransitional:new RegExp(`^(?:::)(${r}\\.${r}\\.${r}\\.${r}(%[0-9a-z]{1,})?)$`,"i"),transitional:new RegExp(`^((?:${o})|(?:::)(?:${o})?)${r}\\.${r}\\.${r}\\.${r}(%[0-9a-z]{1,})?$`,"i")};function a(t,r){if(t.indexOf("::")!==t.lastIndexOf("::"))return null;let e,n,i=0,o=-1,a=(t.match(s.zoneIndex)||[])[0];for(a&&(a=a.substring(1),t=t.replace(/%.+$/,""));(o=t.indexOf(":",o+1))>=0;)i++;if("::"===t.substr(0,2)&&i--,"::"===t.substr(-2,2)&&i--,i>r)return null;for(n=r-i,e=":";n--;)e+="0:";return":"===(t=t.replace("::",e))[0]&&(t=t.slice(1)),":"===t[t.length-1]&&(t=t.slice(0,-1)),{parts:r=function(){const r=t.split(":"),e=[];for(let t=0;t<r.length;t++)e.push(parseInt(r[t],16));return e}(),zoneId:a}}function p(t,r,e,n){if(t.length!==r.length)throw new Error("ipaddr: cannot match CIDR for objects with different lengths");let i,o=0;for(;n>0;){if((i=e-n)<0&&(i=0),t[o]>>i!=r[o]>>i)return!1;n-=e,o+=1}return!0}function u(t){if(i.test(t))return parseInt(t,16);if("0"===t[0]&&!isNaN(parseInt(t[1],10))){if(n.test(t))return parseInt(t,8);throw new Error(`ipaddr: cannot parse ${t} as octal`)}return parseInt(t,10)}function d(t,r){for(;t.length<r;)t=`0${t}`;return t}const h={};h.IPv4=function(){function t(t){if(4!==t.length)throw new Error("ipaddr: ipv4 octet count should be 4");let r,e;for(r=0;r<t.length;r++)if(!(0<=(e=t[r])&&e<=255))throw new Error("ipaddr: ipv4 octet should fit in 8 bits");this.octets=t}return t.prototype.SpecialRanges={unspecified:[[new t([0,0,0,0]),8]],broadcast:[[new t([255,255,255,255]),32]],multicast:[[new t([224,0,0,0]),4]],linkLocal:[[new t([169,254,0,0]),16]],loopback:[[new t([127,0,0,0]),8]],carrierGradeNat:[[new t([100,64,0,0]),10]],private:[[new t([10,0,0,0]),8],[new t([172,16,0,0]),12],[new t([192,168,0,0]),16]],reserved:[[new t([192,0,0,0]),24],[new t([192,0,2,0]),24],[new t([192,88,99,0]),24],[new t([198,18,0,0]),15],[new t([198,51,100,0]),24],[new t([203,0,113,0]),24],[new t([240,0,0,0]),4]]},t.prototype.kind=function(){return"ipv4"},t.prototype.match=function(t,r){let e;if(void 0===r&&(t=(e=t)[0],r=e[1]),"ipv4"!==t.kind())throw new Error("ipaddr: cannot match ipv4 address with non-ipv4 one");return p(this.octets,t.octets,8,r)},t.prototype.prefixLengthFromSubnetMask=function(){let t=0,r=!1;const e={0:8,128:7,192:6,224:5,240:4,248:3,252:2,254:1,255:0};let n,i,o;for(n=3;n>=0;n-=1){if(!((i=this.octets[n])in e))return null;if(o=e[i],r&&0!==o)return null;8!==o&&(r=!0),t+=o}return 32-t},t.prototype.range=function(){return h.subnetMatch(this,this.SpecialRanges)},t.prototype.toByteArray=function(){return this.octets.slice(0)},t.prototype.toIPv4MappedAddress=function(){return h.IPv6.parse(`::ffff:${this.toString()}`)},t.prototype.toNormalizedString=function(){return this.toString()},t.prototype.toString=function(){return this.octets.join(".")},t}(),h.IPv4.broadcastAddressFromCIDR=function(t){try{const r=this.parseCIDR(t),e=r[0].toByteArray(),n=this.subnetMaskFromPrefixLength(r[1]).toByteArray(),i=[];let o=0;for(;o<4;)i.push(parseInt(e[o],10)|255^parseInt(n[o],10)),o++;return new this(i)}catch(t){throw new Error("ipaddr: the address does not have IPv4 CIDR format")}},h.IPv4.isIPv4=function(t){return null!==this.parser(t)},h.IPv4.isValid=function(t){try{return new this(this.parser(t)),!0}catch(t){return!1}},h.IPv4.isValidFourPartDecimal=function(t){return!(!h.IPv4.isValid(t)||!t.match(/^(0|[1-9]\d*)(\.(0|[1-9]\d*)){3}$/))},h.IPv4.networkAddressFromCIDR=function(t){let r,e,n,i,o;try{for(n=(r=this.parseCIDR(t))[0].toByteArray(),o=this.subnetMaskFromPrefixLength(r[1]).toByteArray(),i=[],e=0;e<4;)i.push(parseInt(n[e],10)&parseInt(o[e],10)),e++;return new this(i)}catch(t){throw new Error("ipaddr: the address does not have IPv4 CIDR format")}},h.IPv4.parse=function(t){const r=this.parser(t);if(null===r)throw new Error("ipaddr: string is not formatted like an IPv4 Address");return new this(r)},h.IPv4.parseCIDR=function(t){let r;if(r=t.match(/^(.+)\/(\d+)$/)){const t=parseInt(r[2]);if(t>=0&&t<=32){const e=[this.parse(r[1]),t];return Object.defineProperty(e,"toString",{value:function(){return this.join("/")}}),e}}throw new Error("ipaddr: string is not formatted like an IPv4 CIDR range")},h.IPv4.parser=function(t){let r,n,i;if(r=t.match(e.fourOctet))return function(){const t=r.slice(1,6),e=[];for(let r=0;r<t.length;r++)n=t[r],e.push(u(n));return e}();if(r=t.match(e.longValue)){if((i=u(r[1]))>4294967295||i<0)throw new Error("ipaddr: address outside defined range");return function(){const t=[];let r;for(r=0;r<=24;r+=8)t.push(i>>r&255);return t}().reverse()}return(r=t.match(e.twoOctet))?function(){const t=r.slice(1,4),e=[];if((i=u(t[1]))>16777215||i<0)throw new Error("ipaddr: address outside defined range");return e.push(u(t[0])),e.push(i>>16&255),e.push(i>>8&255),e.push(255&i),e}():(r=t.match(e.threeOctet))?function(){const t=r.slice(1,5),e=[];if((i=u(t[2]))>65535||i<0)throw new Error("ipaddr: address outside defined range");return e.push(u(t[0])),e.push(u(t[1])),e.push(i>>8&255),e.push(255&i),e}():null},h.IPv4.subnetMaskFromPrefixLength=function(t){if((t=parseInt(t))<0||t>32)throw new Error("ipaddr: invalid IPv4 prefix length");const r=[0,0,0,0];let e=0;const n=Math.floor(t/8);for(;e<n;)r[e]=255,e++;return n<4&&(r[n]=Math.pow(2,t%8)-1<<8-t%8),new this(r)},h.IPv6=function(){function t(t,r){let e,n;if(16===t.length)for(this.parts=[],e=0;e<=14;e+=2)this.parts.push(t[e]<<8|t[e+1]);else{if(8!==t.length)throw new Error("ipaddr: ipv6 part count should be 8 or 16");this.parts=t}for(e=0;e<this.parts.length;e++)if(!(0<=(n=this.parts[e])&&n<=65535))throw new Error("ipaddr: ipv6 part should fit in 16 bits");r&&(this.zoneId=r)}return t.prototype.SpecialRanges={unspecified:[new t([0,0,0,0,0,0,0,0]),128],linkLocal:[new t([65152,0,0,0,0,0,0,0]),10],multicast:[new t([65280,0,0,0,0,0,0,0]),8],loopback:[new t([0,0,0,0,0,0,0,1]),128],uniqueLocal:[new t([64512,0,0,0,0,0,0,0]),7],ipv4Mapped:[new t([0,0,0,0,0,65535,0,0]),96],rfc6145:[new t([0,0,0,0,65535,0,0,0]),96],rfc6052:[new t([100,65435,0,0,0,0,0,0]),96],"6to4":[new t([8194,0,0,0,0,0,0,0]),16],teredo:[new t([8193,0,0,0,0,0,0,0]),32],reserved:[[new t([8193,3512,0,0,0,0,0,0]),32]],benchmarking:[new t([8193,2,0,0,0,0,0,0]),48],amt:[new t([8193,3,0,0,0,0,0,0]),32],as112v6:[new t([8193,4,274,0,0,0,0,0]),48],deprecated:[new t([8193,16,0,0,0,0,0,0]),28],orchid2:[new t([8193,32,0,0,0,0,0,0]),28]},t.prototype.isIPv4MappedAddress=function(){return"ipv4Mapped"===this.range()},t.prototype.kind=function(){return"ipv6"},t.prototype.match=function(t,r){let e;if(void 0===r&&(t=(e=t)[0],r=e[1]),"ipv6"!==t.kind())throw new Error("ipaddr: cannot match ipv6 address with non-ipv6 one");return p(this.parts,t.parts,16,r)},t.prototype.prefixLengthFromSubnetMask=function(){let t=0,r=!1;const e={0:16,32768:15,49152:14,57344:13,61440:12,63488:11,64512:10,65024:9,65280:8,65408:7,65472:6,65504:5,65520:4,65528:3,65532:2,65534:1,65535:0};let n,i;for(let o=7;o>=0;o-=1){if(!((n=this.parts[o])in e))return null;if(i=e[n],r&&0!==i)return null;16!==i&&(r=!0),t+=i}return 128-t},t.prototype.range=function(){return h.subnetMatch(this,this.SpecialRanges)},t.prototype.toByteArray=function(){let t;const r=[],e=this.parts;for(let n=0;n<e.length;n++)t=e[n],r.push(t>>8),r.push(255&t);return r},t.prototype.toFixedLengthString=function(){const t=function(){const t=[];for(let r=0;r<this.parts.length;r++)t.push(d(this.parts[r].toString(16),4));return t}.call(this).join(":");let r="";return this.zoneId&&(r=`%${this.zoneId}`),t+r},t.prototype.toIPv4Address=function(){if(!this.isIPv4MappedAddress())throw new Error("ipaddr: trying to convert a generic ipv6 address to ipv4");const t=this.parts.slice(-2),r=t[0],e=t[1];return new h.IPv4([r>>8,255&r,e>>8,255&e])},t.prototype.toNormalizedString=function(){const t=function(){const t=[];for(let r=0;r<this.parts.length;r++)t.push(this.parts[r].toString(16));return t}.call(this).join(":");let r="";return this.zoneId&&(r=`%${this.zoneId}`),t+r},t.prototype.toRFC5952String=function(){const t=/((^|:)(0(:|$)){2,})/g,r=this.toNormalizedString();let e,n=0,i=-1;for(;e=t.exec(r);)e[0].length>i&&(n=e.index,i=e[0].length);return i<0?r:`${r.substring(0,n)}::${r.substring(n+i)}`},t.prototype.toString=function(){return this.toRFC5952String()},t}(),h.IPv6.broadcastAddressFromCIDR=function(t){try{const r=this.parseCIDR(t),e=r[0].toByteArray(),n=this.subnetMaskFromPrefixLength(r[1]).toByteArray(),i=[];let o=0;for(;o<16;)i.push(parseInt(e[o],10)|255^parseInt(n[o],10)),o++;return new this(i)}catch(t){throw new Error(`ipaddr: the address does not have IPv6 CIDR format (${t})`)}},h.IPv6.isIPv6=function(t){return null!==this.parser(t)},h.IPv6.isValid=function(t){if("string"==typeof t&&-1===t.indexOf(":"))return!1;try{const r=this.parser(t);return new this(r.parts,r.zoneId),!0}catch(t){return!1}},h.IPv6.networkAddressFromCIDR=function(t){let r,e,n,i,o;try{for(n=(r=this.parseCIDR(t))[0].toByteArray(),o=this.subnetMaskFromPrefixLength(r[1]).toByteArray(),i=[],e=0;e<16;)i.push(parseInt(n[e],10)&parseInt(o[e],10)),e++;return new this(i)}catch(t){throw new Error(`ipaddr: the address does not have IPv6 CIDR format (${t})`)}},h.IPv6.parse=function(t){const r=this.parser(t);if(null===r.parts)throw new Error("ipaddr: string is not formatted like an IPv6 Address");return new this(r.parts,r.zoneId)},h.IPv6.parseCIDR=function(t){let r,e,n;if((e=t.match(/^(.+)\/(\d+)$/))&&(r=parseInt(e[2]))>=0&&r<=128)return n=[this.parse(e[1]),r],Object.defineProperty(n,"toString",{value:function(){return this.join("/")}}),n;throw new Error("ipaddr: string is not formatted like an IPv6 CIDR range")},h.IPv6.parser=function(t){let r,e,n,i,o,p;if(n=t.match(s.deprecatedTransitional))return this.parser(`::ffff:${n[1]}`);if(s.native.test(t))return a(t,8);if((n=t.match(s.transitional))&&(p=n[6]||"",(r=a(n[1].slice(0,-1)+p,6)).parts)){for(o=[parseInt(n[2]),parseInt(n[3]),parseInt(n[4]),parseInt(n[5])],e=0;e<o.length;e++)if(!(0<=(i=o[e])&&i<=255))return null;return r.parts.push(o[0]<<8|o[1]),r.parts.push(o[2]<<8|o[3]),{parts:r.parts,zoneId:r.zoneId}}return null},h.IPv6.subnetMaskFromPrefixLength=function(t){if((t=parseInt(t))<0||t>128)throw new Error("ipaddr: invalid IPv6 prefix length");const r=[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];let e=0;const n=Math.floor(t/8);for(;e<n;)r[e]=255,e++;return n<16&&(r[n]=Math.pow(2,t%8)-1<<8-t%8),new this(r)},h.fromByteArray=function(t){const r=t.length;if(4===r)return new h.IPv4(t);if(16===r)return new h.IPv6(t);throw new Error("ipaddr: the binary input is neither an IPv6 nor IPv4 address")},h.isValid=function(t){return h.IPv6.isValid(t)||h.IPv4.isValid(t)},h.parse=function(t){if(h.IPv6.isValid(t))return h.IPv6.parse(t);if(h.IPv4.isValid(t))return h.IPv4.parse(t);throw new Error("ipaddr: the address has neither IPv6 nor IPv4 format")},h.parseCIDR=function(t){try{return h.IPv6.parseCIDR(t)}catch(r){try{return h.IPv4.parseCIDR(t)}catch(t){throw new Error("ipaddr: the address has neither IPv6 nor IPv4 CIDR format")}}},h.process=function(t){const r=this.parse(t);return"ipv6"===r.kind()&&r.isIPv4MappedAddress()?r.toIPv4Address():r},h.subnetMatch=function(t,r,e){let n,i,o,s;for(i in void 0!==e&&null!==e||(e="unicast"),r)if(Object.prototype.hasOwnProperty.call(r,i))for(!(o=r[i])[0]||o[0]instanceof Array||(o=[o]),n=0;n<o.length;n++)if(s=o[n],t.kind()===s[0].kind()&&t.match.apply(t,s))return i;return e},"undefined"!=typeof module&&module.exports?module.exports=h:t.ipaddr=h}(this)}("undefined"==typeof window?window={}:window);
\ No newline at end of file
+!function(t){!function(t){"use strict";const r="(0?\\d+|0x[a-f0-9]+)",e={fourOctet:new RegExp(`^${r}\\.${r}\\.${r}\\.${r}$`,"i"),threeOctet:new RegExp(`^${r}\\.${r}\\.${r}$`,"i"),twoOctet:new RegExp(`^${r}\\.${r}$`,"i"),longValue:new RegExp(`^${r}$`,"i")},n=new RegExp("^0[0-7]+$","i"),i=new RegExp("^0x[a-f0-9]+$","i"),o="(?:[0-9a-f]+::?)+",s={zoneIndex:new RegExp("%[0-9a-z]{1,}","i"),native:new RegExp(`^(::)?(${o})?([0-9a-f]+)?(::)?(%[0-9a-z]{1,})?$`,"i"),deprecatedTransitional:new RegExp(`^(?:::)(${r}\\.${r}\\.${r}\\.${r}(%[0-9a-z]{1,})?)$`,"i"),transitional:new RegExp(`^((?:${o})|(?:::)(?:${o})?)${r}\\.${r}\\.${r}\\.${r}(%[0-9a-z]{1,})?$`,"i")};function a(t,r){if(t.indexOf("::")!==t.lastIndexOf("::"))return null;let e,n,i=0,o=-1,a=(t.match(s.zoneIndex)||[])[0];for(a&&(a=a.substring(1),t=t.replace(/%.+$/,""));(o=t.indexOf(":",o+1))>=0;)i++;if("::"===t.substr(0,2)&&i--,"::"===t.substr(-2,2)&&i--,i>r)return null;for(n=r-i,e=":";n--;)e+="0:";return":"===(t=t.replace("::",e))[0]&&(t=t.slice(1)),":"===t[t.length-1]&&(t=t.slice(0,-1)),{parts:r=function(){const r=t.split(":"),e=[];for(let t=0;t<r.length;t++)e.push(parseInt(r[t],16));return e}(),zoneId:a}}function p(t,r,e,n){if(t.length!==r.length)throw new Error("ipaddr: cannot match CIDR for objects with different lengths");let i,o=0;for(;n>0;){if((i=e-n)<0&&(i=0),t[o]>>i!=r[o]>>i)return!1;n-=e,o+=1}return!0}function u(t){if(i.test(t))return parseInt(t,16);if("0"===t[0]&&!isNaN(parseInt(t[1],10))){if(n.test(t))return parseInt(t,8);throw new Error(`ipaddr: cannot parse ${t} as octal`)}return parseInt(t,10)}function d(t,r){for(;t.length<r;)t=`0${t}`;return t}const h={};h.IPv4=function(){function t(t){if(4!==t.length)throw new Error("ipaddr: ipv4 octet count should be 4");let r,e;for(r=0;r<t.length;r++)if(!(0<=(e=t[r])&&e<=255))throw new Error("ipaddr: ipv4 octet should fit in 8 bits");this.octets=t}return t.prototype.SpecialRanges={unspecified:[[new t([0,0,0,0]),8]],broadcast:[[new t([255,255,255,255]),32]],multicast:[[new t([224,0,0,0]),4]],linkLocal:[[new t([169,254,0,0]),16]],loopback:[[new t([127,0,0,0]),8]],carrierGradeNat:[[new t([100,64,0,0]),10]],private:[[new t([10,0,0,0]),8],[new t([172,16,0,0]),12],[new t([192,168,0,0]),16]],reserved:[[new t([192,0,0,0]),24],[new t([192,0,2,0]),24],[new t([192,88,99,0]),24],[new t([198,18,0,0]),15],[new t([198,51,100,0]),24],[new t([203,0,113,0]),24],[new t([240,0,0,0]),4]],as112:[[new t([192,175,48,0]),24],[new t([192,31,196,0]),24]],amt:[[new t([192,52,193,0]),24]]},t.prototype.kind=function(){return"ipv4"},t.prototype.match=function(t,r){let e;if(void 0===r&&(t=(e=t)[0],r=e[1]),"ipv4"!==t.kind())throw new Error("ipaddr: cannot match ipv4 address with non-ipv4 one");return p(this.octets,t.octets,8,r)},t.prototype.prefixLengthFromSubnetMask=function(){let t=0,r=!1;const e={0:8,128:7,192:6,224:5,240:4,248:3,252:2,254:1,255:0};let n,i,o;for(n=3;n>=0;n-=1){if(!((i=this.octets[n])in e))return null;if(o=e[i],r&&0!==o)return null;8!==o&&(r=!0),t+=o}return 32-t},t.prototype.range=function(){return h.subnetMatch(this,this.SpecialRanges)},t.prototype.toByteArray=function(){return this.octets.slice(0)},t.prototype.toIPv4MappedAddress=function(){return h.IPv6.parse(`::ffff:${this.toString()}`)},t.prototype.toNormalizedString=function(){return this.toString()},t.prototype.toString=function(){return this.octets.join(".")},t}(),h.IPv4.broadcastAddressFromCIDR=function(t){try{const r=this.parseCIDR(t),e=r[0].toByteArray(),n=this.subnetMaskFromPrefixLength(r[1]).toByteArray(),i=[];let o=0;for(;o<4;)i.push(parseInt(e[o],10)|255^parseInt(n[o],10)),o++;return new this(i)}catch(t){throw new Error("ipaddr: the address does not have IPv4 CIDR format")}},h.IPv4.isIPv4=function(t){return null!==this.parser(t)},h.IPv4.isValid=function(t){try{return new this(this.parser(t)),!0}catch(t){return!1}},h.IPv4.isValidFourPartDecimal=function(t){return!(!h.IPv4.isValid(t)||!t.match(/^(0|[1-9]\d*)(\.(0|[1-9]\d*)){3}$/))},h.IPv4.networkAddressFromCIDR=function(t){let r,e,n,i,o;try{for(n=(r=this.parseCIDR(t))[0].toByteArray(),o=this.subnetMaskFromPrefixLength(r[1]).toByteArray(),i=[],e=0;e<4;)i.push(parseInt(n[e],10)&parseInt(o[e],10)),e++;return new this(i)}catch(t){throw new Error("ipaddr: the address does not have IPv4 CIDR format")}},h.IPv4.parse=function(t){const r=this.parser(t);if(null===r)throw new Error("ipaddr: string is not formatted like an IPv4 Address");return new this(r)},h.IPv4.parseCIDR=function(t){let r;if(r=t.match(/^(.+)\/(\d+)$/)){const t=parseInt(r[2]);if(t>=0&&t<=32){const e=[this.parse(r[1]),t];return Object.defineProperty(e,"toString",{value:function(){return this.join("/")}}),e}}throw new Error("ipaddr: string is not formatted like an IPv4 CIDR range")},h.IPv4.parser=function(t){let r,n,i;if(r=t.match(e.fourOctet))return function(){const t=r.slice(1,6),e=[];for(let r=0;r<t.length;r++)n=t[r],e.push(u(n));return e}();if(r=t.match(e.longValue)){if((i=u(r[1]))>4294967295||i<0)throw new Error("ipaddr: address outside defined range");return function(){const t=[];let r;for(r=0;r<=24;r+=8)t.push(i>>r&255);return t}().reverse()}return(r=t.match(e.twoOctet))?function(){const t=r.slice(1,4),e=[];if((i=u(t[1]))>16777215||i<0)throw new Error("ipaddr: address outside defined range");return e.push(u(t[0])),e.push(i>>16&255),e.push(i>>8&255),e.push(255&i),e}():(r=t.match(e.threeOctet))?function(){const t=r.slice(1,5),e=[];if((i=u(t[2]))>65535||i<0)throw new Error("ipaddr: address outside defined range");return e.push(u(t[0])),e.push(u(t[1])),e.push(i>>8&255),e.push(255&i),e}():null},h.IPv4.subnetMaskFromPrefixLength=function(t){if((t=parseInt(t))<0||t>32)throw new Error("ipaddr: invalid IPv4 prefix length");const r=[0,0,0,0];let e=0;const n=Math.floor(t/8);for(;e<n;)r[e]=255,e++;return n<4&&(r[n]=Math.pow(2,t%8)-1<<8-t%8),new this(r)},h.IPv6=function(){function t(t,r){let e,n;if(16===t.length)for(this.parts=[],e=0;e<=14;e+=2)this.parts.push(t[e]<<8|t[e+1]);else{if(8!==t.length)throw new Error("ipaddr: ipv6 part count should be 8 or 16");this.parts=t}for(e=0;e<this.parts.length;e++)if(!(0<=(n=this.parts[e])&&n<=65535))throw new Error("ipaddr: ipv6 part should fit in 16 bits");r&&(this.zoneId=r)}return t.prototype.SpecialRanges={unspecified:[new t([0,0,0,0,0,0,0,0]),128],linkLocal:[new t([65152,0,0,0,0,0,0,0]),10],multicast:[new t([65280,0,0,0,0,0,0,0]),8],loopback:[new t([0,0,0,0,0,0,0,1]),128],uniqueLocal:[new t([64512,0,0,0,0,0,0,0]),7],ipv4Mapped:[new t([0,0,0,0,0,65535,0,0]),96],discard:[new t([256,0,0,0,0,0,0,0]),64],rfc6145:[new t([0,0,0,0,65535,0,0,0]),96],rfc6052:[new t([100,65435,0,0,0,0,0,0]),96],"6to4":[new t([8194,0,0,0,0,0,0,0]),16],teredo:[new t([8193,0,0,0,0,0,0,0]),32],benchmarking:[new t([8193,2,0,0,0,0,0,0]),48],amt:[new t([8193,3,0,0,0,0,0,0]),32],as112v6:[[new t([8193,4,274,0,0,0,0,0]),48],[new t([9760,79,32768,0,0,0,0,0]),48]],deprecated:[new t([8193,16,0,0,0,0,0,0]),28],orchid2:[new t([8193,32,0,0,0,0,0,0]),28],droneRemoteIdProtocolEntityTags:[new t([8193,48,0,0,0,0,0,0]),28],reserved:[[new t([8193,0,0,0,0,0,0,0]),23],[new t([8193,3512,0,0,0,0,0,0]),32]]},t.prototype.isIPv4MappedAddress=function(){return"ipv4Mapped"===this.range()},t.prototype.kind=function(){return"ipv6"},t.prototype.match=function(t,r){let e;if(void 0===r&&(t=(e=t)[0],r=e[1]),"ipv6"!==t.kind())throw new Error("ipaddr: cannot match ipv6 address with non-ipv6 one");return p(this.parts,t.parts,16,r)},t.prototype.prefixLengthFromSubnetMask=function(){let t=0,r=!1;const e={0:16,32768:15,49152:14,57344:13,61440:12,63488:11,64512:10,65024:9,65280:8,65408:7,65472:6,65504:5,65520:4,65528:3,65532:2,65534:1,65535:0};let n,i;for(let o=7;o>=0;o-=1){if(!((n=this.parts[o])in e))return null;if(i=e[n],r&&0!==i)return null;16!==i&&(r=!0),t+=i}return 128-t},t.prototype.range=function(){return h.subnetMatch(this,this.SpecialRanges)},t.prototype.toByteArray=function(){let t;const r=[],e=this.parts;for(let n=0;n<e.length;n++)t=e[n],r.push(t>>8),r.push(255&t);return r},t.prototype.toFixedLengthString=function(){const t=function(){const t=[];for(let r=0;r<this.parts.length;r++)t.push(d(this.parts[r].toString(16),4));return t}.call(this).join(":");let r="";return this.zoneId&&(r=`%${this.zoneId}`),t+r},t.prototype.toIPv4Address=function(){if(!this.isIPv4MappedAddress())throw new Error("ipaddr: trying to convert a generic ipv6 address to ipv4");const t=this.parts.slice(-2),r=t[0],e=t[1];return new h.IPv4([r>>8,255&r,e>>8,255&e])},t.prototype.toNormalizedString=function(){const t=function(){const t=[];for(let r=0;r<this.parts.length;r++)t.push(this.parts[r].toString(16));return t}.call(this).join(":");let r="";return this.zoneId&&(r=`%${this.zoneId}`),t+r},t.prototype.toRFC5952String=function(){const t=/((^|:)(0(:|$)){2,})/g,r=this.toNormalizedString();let e,n=0,i=-1;for(;e=t.exec(r);)e[0].length>i&&(n=e.index,i=e[0].length);return i<0?r:`${r.substring(0,n)}::${r.substring(n+i)}`},t.prototype.toString=function(){return this.toRFC5952String()},t}(),h.IPv6.broadcastAddressFromCIDR=function(t){try{const r=this.parseCIDR(t),e=r[0].toByteArray(),n=this.subnetMaskFromPrefixLength(r[1]).toByteArray(),i=[];let o=0;for(;o<16;)i.push(parseInt(e[o],10)|255^parseInt(n[o],10)),o++;return new this(i)}catch(t){throw new Error(`ipaddr: the address does not have IPv6 CIDR format (${t})`)}},h.IPv6.isIPv6=function(t){return null!==this.parser(t)},h.IPv6.isValid=function(t){if("string"==typeof t&&-1===t.indexOf(":"))return!1;try{const r=this.parser(t);return new this(r.parts,r.zoneId),!0}catch(t){return!1}},h.IPv6.networkAddressFromCIDR=function(t){let r,e,n,i,o;try{for(n=(r=this.parseCIDR(t))[0].toByteArray(),o=this.subnetMaskFromPrefixLength(r[1]).toByteArray(),i=[],e=0;e<16;)i.push(parseInt(n[e],10)&parseInt(o[e],10)),e++;return new this(i)}catch(t){throw new Error(`ipaddr: the address does not have IPv6 CIDR format (${t})`)}},h.IPv6.parse=function(t){const r=this.parser(t);if(null===r.parts)throw new Error("ipaddr: string is not formatted like an IPv6 Address");return new this(r.parts,r.zoneId)},h.IPv6.parseCIDR=function(t){let r,e,n;if((e=t.match(/^(.+)\/(\d+)$/))&&(r=parseInt(e[2]))>=0&&r<=128)return n=[this.parse(e[1]),r],Object.defineProperty(n,"toString",{value:function(){return this.join("/")}}),n;throw new Error("ipaddr: string is not formatted like an IPv6 CIDR range")},h.IPv6.parser=function(t){let r,e,n,i,o,p;if(n=t.match(s.deprecatedTransitional))return this.parser(`::ffff:${n[1]}`);if(s.native.test(t))return a(t,8);if((n=t.match(s.transitional))&&(p=n[6]||"",r=n[1],n[1].endsWith("::")||(r=r.slice(0,-1)),(r=a(r+p,6)).parts)){for(o=[parseInt(n[2]),parseInt(n[3]),parseInt(n[4]),parseInt(n[5])],e=0;e<o.length;e++)if(!(0<=(i=o[e])&&i<=255))return null;return r.parts.push(o[0]<<8|o[1]),r.parts.push(o[2]<<8|o[3]),{parts:r.parts,zoneId:r.zoneId}}return null},h.IPv6.subnetMaskFromPrefixLength=function(t){if((t=parseInt(t))<0||t>128)throw new Error("ipaddr: invalid IPv6 prefix length");const r=[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];let e=0;const n=Math.floor(t/8);for(;e<n;)r[e]=255,e++;return n<16&&(r[n]=Math.pow(2,t%8)-1<<8-t%8),new this(r)},h.fromByteArray=function(t){const r=t.length;if(4===r)return new h.IPv4(t);if(16===r)return new h.IPv6(t);throw new Error("ipaddr: the binary input is neither an IPv6 nor IPv4 address")},h.isValid=function(t){return h.IPv6.isValid(t)||h.IPv4.isValid(t)},h.parse=function(t){if(h.IPv6.isValid(t))return h.IPv6.parse(t);if(h.IPv4.isValid(t))return h.IPv4.parse(t);throw new Error("ipaddr: the address has neither IPv6 nor IPv4 format")},h.parseCIDR=function(t){try{return h.IPv6.parseCIDR(t)}catch(r){try{return h.IPv4.parseCIDR(t)}catch(t){throw new Error("ipaddr: the address has neither IPv6 nor IPv4 CIDR format")}}},h.process=function(t){const r=this.parse(t);return"ipv6"===r.kind()&&r.isIPv4MappedAddress()?r.toIPv4Address():r},h.subnetMatch=function(t,r,e){let n,i,o,s;for(i in void 0!==e&&null!==e||(e="unicast"),r)if(Object.prototype.hasOwnProperty.call(r,i))for(!(o=r[i])[0]||o[0]instanceof Array||(o=[o]),n=0;n<o.length;n++)if(s=o[n],t.kind()===s[0].kind()&&t.match.apply(t,s))return i;return e},"undefined"!=typeof module&&module.exports?module.exports=h:t.ipaddr=h}(this)}("undefined"==typeof window?window={}:window);
\ No newline at end of file
diff --git a/lib/ipaddr.js b/lib/ipaddr.js
index 235c66b..d203f0e 100644
--- a/lib/ipaddr.js
+++ b/lib/ipaddr.js
@@ -874,7 +874,11 @@
         }
         if ((match = string.match(ipv6Regexes.transitional))) {
             zoneId = match[6] || '';
-            addr = expandIPv6(match[1].slice(0, -1) + zoneId, 6);
+            addr = match[1]
+            if (!match[1].endsWith('::')) {
+                addr = addr.slice(0, -1)
+            }
+            addr = expandIPv6(addr + zoneId, 6);
             if (addr.parts) {
                 octets = [
                     parseInt(match[2]),


Test patch:
diff --git a/test/ipaddr.test.js b/test/ipaddr.test.js
index b5a29b2..eb405df 100644
--- a/test/ipaddr.test.js
+++ b/test/ipaddr.test.js
@@ -354,6 +354,8 @@ describe('ipaddr', () => {
         assert.deepEqual(ipaddr.IPv6.parse('2001:db8:F53A::').parts, [0x2001, 0xdb8, 0xf53a, 0, 0, 0, 0, 0]);
         assert.deepEqual(ipaddr.IPv6.parse('::1').parts, [0, 0, 0, 0, 0, 0, 0, 1]);
         assert.deepEqual(ipaddr.IPv6.parse('::8.8.8.8').parts, [0, 0, 0, 0, 0, 0xffff, 2056, 2056]);
+        assert.deepEqual(ipaddr.IPv6.parse('FFFF::255.255.255.255').parts, [0xffff, 0, 0, 0, 0, 0, 0xffff, 0xffff]);
+        assert.deepEqual(ipaddr.IPv6.parse('64:ff9a::0.0.0.0').parts, [0x64, 0xff9a, 0, 0, 0, 0, 0, 0]);
         assert.deepEqual(ipaddr.IPv6.parse('::').parts, [0, 0, 0, 0, 0, 0, 0, 0]);
         assert.deepEqual(ipaddr.IPv6.parse('::%z').parts, [0, 0, 0, 0, 0, 0, 0, 0]);
         assert.deepEqual(ipaddr.IPv6.parse('::%z').zoneId, 'z');