Q:

IpSubnet and CIDR Deprecated in Netty 4

I'm upgrading from Netty 3 to Netty 4 and am trying to track down the history/intent of IpCubnet and CIDR classes being deprecated.  
I could not find any mention in release notes.  I found a commit removed the classes - "Remove the codecs and handlers that can't make it on time for 4.0.0.A1"
https://github.com/netty/netty/commit/45f19d02ff9a9e2c72e4d95e38c5d7f73960fe57
Is this functionality deprecated for some reason?  Or has it just not made it's way back in to Netty 4?  

A:

These classes were rewritten and replaced.  Now you may use alternatives like AbstractRemoteAddressFilter, UniqueIpFilter, RuleBasedIpFilter, IpSubnetFilterRule, etc. 
Have a look into io.netty.handler.ipfilter package.