sharing software Unofficial 30718 UDP Lantronix Discovery for Lantronix serial-to-ethernet devices Unofficial 30777 TCP ZangZing agent Unofficial 31337 TCP Back Orifice —remote administration tool (often Trojan horse ) Unofficial 31415 ThoughtSignal —Server Communication Service (often Informational ) Unofficial 31456 TCP TetriNET IRC gateway on some servers Unofficial 31457 TCP TetriNET Official 31458