This sort of reminds me how some IRC servers that engage in hostmask obfuscation can have it possibly reversed via a table lookup because the seed value used to

This sort of reminds me how some IRC servers that engage in hostmask obfuscation can have it possibly reversed via a table lookup because the seed value used to produce that is generated at compile time based on epoch and said time is generally included in the server details, visible to any user at connect--this is specific to Unreal IRCd. Example: 16:37:30 [network] -!- Welcome to the ircnetwork.network IRC Network afreak!irc@hostmask 16:37:30 [network] -!- Your host is ircnetwork.network, running version Unreal3.2.10.5 16:37:30 [network] -!- This server was created Thu Oct 15 2015 at 00:00:55 UTC