All bans on #jp have been dropped. (21)

7 Name: キタ━━━━━━━━( ・∀・)━━━━━━━━!!!! [Del]

>>6 Me neither, but I can make an educated guess: It's an IRC channel.

In case you don't know what an IRC channel is: IRC is the TLA (Three Letter Acronym) for International Relay Carrier, which are those companies that connect telephone networks between companies. It's a surprisingly profitable business, so of course they use their own communication channels. #jp is probably the message board that connects NTT and its various spin-offs with KDDI and its subsidiaries, SoftBank and their subsidiaries, EMOBILE, Index (a subsidiary of Sega), and Disney.

Or it could refer to the internet analog of Citizen Band radio channels which was invented in 1988 by the Finn Jarkko Oikarinen, who called his protocol the Internet Relay Chat, and which largely replaced the UNIX talk(1) daemon, BITNET relay chat, and MUDs. Any public channels in that network have names that start with the # character, but so do Twitter hashtags, and Twitter is much more widely used for communication, so I think it's much more likely that #jp has to do with telephones.