Package: cidr-brewer
Copyright 2016 Caleb EvansReleased under the MIT licenseCIDR Brewer is a command-line utility which displays information for
classless IP addresses (such as subnet mask and network ID) so you don’t
need to perform the calculations yourself.InstallingYou can install CIDR Brewer via pip (ideally globally):pip install cidr-brewerUsageTo use, runcidr-brewerfrom the command line with one or two IP
addresses.One IP addressIf you pass a single IP address using slash notation, CIDR Brewer will
compute the subnet mask, network ID, broadcast ID, and the range of
valid/available IP addresses.$ ./cidrbrewer.py 192.168.19.100/25
Given IP address:
   192.168.19.100/25  11000000.10101000.00010011.01100100
Subnet mask:
   255.255.255.128    11111111.11111111.11111111.10000000
Network ID:
   192.168.19.0/25    11000000.10101000.00010011.00000000
Broadcast ID:
   192.168.19.127     11000000.10101000.00010011.01111111
First Available Address:
   192.168.19.1       11000000.10101000.00010011.00000001
Last Available Address:
   192.168.19.126     11000000.10101000.00010011.01111110
Subnet Size: 2^7 - 2 = 126Additionally, if you supply a list of block sizes, CIDR Brewer will
compute the same information for each sub-block.$ ./cidrbrewer.py 42.114.152.128/25 --block-sizes 16 64 16 32
Given IP address:
   42.114.152.128/25  00101010.01110010.10011000.10000000
Block 1:
   Block Size: 2^6 = 64
   Network ID:
      42.114.152.128/26  00101010.01110010.10011000.10000000
   Broadcast ID:
      42.114.152.191     00101010.01110010.10011000.10111111
   First Available Address:
      42.114.152.129     00101010.01110010.10011000.10000001
   Last Available Address:
      42.114.152.190     00101010.01110010.10011000.10111110
   Subnet Size: 2^6 - 2 = 62
Block 2:
   Block Size: 2^5 = 32
   Network ID:
      42.114.152.192/27  00101010.01110010.10011000.11000000
   Broadcast ID:
      42.114.152.223     00101010.01110010.10011000.11011111
   First Available Address:
      42.114.152.193     00101010.01110010.10011000.11000001
   Last Available Address:
      42.114.152.222     00101010.01110010.10011000.11011110
   Subnet Size: 2^5 - 2 = 30
Block 3:
   Block Size: 2^4 = 16
   Network ID:
      42.114.152.224/28  00101010.01110010.10011000.11100000
   Broadcast ID:
      42.114.152.239     00101010.01110010.10011000.11101111
   First Available Address:
      42.114.152.225     00101010.01110010.10011000.11100001
   Last Available Address:
      42.114.152.238     00101010.01110010.10011000.11101110
   Subnet Size: 2^4 - 2 = 14
Block 4:
   Block Size: 2^4 = 16
   Network ID:
      42.114.152.240/28  00101010.01110010.10011000.11110000
   Broadcast ID:
      42.114.152.255     00101010.01110010.10011000.11111111
   First Available Address:
      42.114.152.241     00101010.01110010.10011000.11110001
   Last Available Address:
      42.114.152.254     00101010.01110010.10011000.11111110
   Subnet Size: 2^4 - 2 = 14Two IP addressesIf you pass two IP addresses (without slash notation), CIDR Brewer will
also compute the largest subnet mask needed for communication between
the two addresses.$ ./cidrbrewer.py 172.16.11.74 172.16.11.78
Given IP addresses:
   172.16.11.74       10101100.00010000.00001011.01001010
   172.16.11.78       10101100.00010000.00001011.01001110
Largest subnet mask allowing communication:
   29 bits
   255.255.255.248    11111111.11111111.11111111.11111000
Network ID:
   172.16.11.72/29    10101100.00010000.00001011.01001000
Broadcast ID:
   172.16.11.79       10101100.00010000.00001011.01001111
First Available Address:
   172.16.11.73       10101100.00010000.00001011.01001001
Last Available Address:
   172.16.11.78       10101100.00010000.00001011.01001110
Subnet Size: 2^3 - 2 = 6If you pass two IP addresses (with slash notation), CIDR Brewer will
also indicate if the IP addresses can already communicate on their
respective subnets.$ ./cidrbrewer.py 125.47.32.170/25 125.47.32.53/25
Given IP addresses:
   125.47.32.170/25   01111101.00101111.00100000.10101010
   125.47.32.53/25    01111101.00101111.00100000.00110101
Can these IP addresses communicate?
   No
Largest subnet mask allowing communication:
   24 bits
   255.255.255.0      11111111.11111111.11111111.00000000
Network ID:
   125.47.32.0/24     01111101.00101111.00100000.00000000
Broadcast ID:
   125.47.32.255      01111101.00101111.00100000.11111111
First Available Address:
   125.47.32.1        01111101.00101111.00100000.00000001
Last Available Address:
   125.47.32.254      01111101.00101111.00100000.11111110
Subnet Size: 2^8 - 2 = 254ExamplesThe/examplesdirectory contains example IP addresses for you to
test against the utility.