Also there is no mailcow network and I found the ip range on this bridge
11: br-a12b81188341: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:c5:3d:ba:1d brd ff:ff:ff:ff:ff:ff
inet 172.22.0.1/16 brd 172.22.255.255 scope global br-a12b81188341
valid_lft forever preferred_lft forever
I do not get why /16 is the default for docker, seems liek a huge waste. Initialle cowmail had another IP space which was already in use by another container.
docker network ls
NETWORK ID NAME DRIVER SCOPE
f989234d177f bridge bridge local
0646c9ac1dd8 host host local
3610dce0a4e3 nextcloud_backend bridge local
a12b81188341 nextcloud_default bridge local
f4bf5f8b511b nginx-internal bridge local
63023c7048a6 nginx_default bridge local
9eac7f4c98a5 none null local
17c0ad5a0c05 redir_default bridge local
ae52cbd9668a ts3_default bridge local
f076a5fa04b5 watchtower_default bridge local