mcfirst(1) on Linux
The text b2387defc21d, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it. The page shows this text now.
check if you can receive IPv4/IPv6 multicast
Flags it lists
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-4 -
-6 -
-I -
-c -
-r -
-t -
-v