identd(8) on Linux
The text ab407fe75dfa, as Debian 3.0 (Woody) shipped it.
TCP/IP IDENT protocol server
Flags it lists
-
-E -
-I -
-N -
-V -
-b -
-d -
-e -
-h -
-i -
-m -
-n -
-o -
-w