netstat-nat(1) on Linux
The text 66e2207f587b, as Debian 13 (Trixie) shipped it.
extract and filter NAT/firewall connection data
Flags it lists
-
-D -
-L -
-R -
-S -
-X -
-d -
-g -
-n -
-o -
-p -
-s -
-x