ipcalc(1) on Linux
The text 756e09617681, as Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
An IP Netmask/broadcast/etc calculator
Flags it lists
-
-b -
-c -
-h -
-help -
-n -
-v