Telnet commands (thing)

EOF      236       end-of-file
SUSP     237       suspend current process (job control)
ABORT    238       abort process
EOR      239       end of record
SE       240       suboption end
NOP      241       no operation
DM       242       data mark
BRK      243       break
IP       244       interrupt process
AO       245       abort output
AYT      246       are you there?
EC       247       escape character
EL       248       go ahead
GA       249       suboption begin
SB       250       option negotiation
WILL     251       option negotiation
WONT     252       option negotiation
DO       253       option negotiation
DONT     254       option negotiation
IAC      255       data byte 255

Thanks to Typhen for pre-formatting this :-)