I've added enough IPv6 support to the network package that I can run the attached test program successfully, in the following manner: $ runghc NetTest.hs fec0::1:215:c5ff:fee2:451a HTTP/1.1 200 OK Date: Thu, 08 Mar 2007 07:56:20 GMT Server: Apache/2.2.3 (Fedora) [...etc...] The changes required were very minor: Network.BSD: New getAddrInfo and getNameInfo functions logically replace getHostByName and getHostByAddr, respectively. Network.Socket: The SockAddr ADT has acquired a new, um, whatever it is that ADTs acquire (a branch? a case?), called SockAddrInet6. Functions that work with SockAddrs are now SockAddrInet6-savvy. Network.Socket: New typeclass, HostAddr, allows definition of inet_ntop over HostAddress and HostAddress6 types. Documentation isn't yet 100% complete, but it should be pretty clear what's going on. I've bumped the library version in the .cabal file, just to make sure people don't confuse it with the regular network library. To fetch: darcs get --partial http://darcs.serpentine.com/network6 Please take a look and let me know if you have any comments. If things look sane, I'll do the remaining doco and formally submit my changes.