identd(8) on Linux
The text 61b4cb6f0453, as Debian 3.1 (Sarge) shipped it.
TCP/IP IDENT protocol server
Flags it lists
-
-E -
-I -
-N -
-V -
-b -
-d -
-e -
-h -
-i -
-m -
-n -
-o -
-w