difference between 0.0.0.0 and * network in ss output

The ss command seems to distinguish between * and 0.0.0.0. While the listing of ssh with 0.0.0.0:22 and [::]:22 is clear, *:7946 and *:80 is not quite as much.

$ ss -ntl
State    Recv-Q   Send-Q     Local Address:Port     Peer Address:Port  
LISTEN   0        128              0.0.0.0:22            0.0.0.0:*     
LISTEN   0        128                    *:7946                *:*     
LISTEN   0        128                    *:80                  *:*     
LISTEN   0        128                 [::]:22               [::]:* 

Why isn't it 0.0.0.0:7946 and 0.0.0.0:80? What's the difference here?

Solution 1:

The difference lies inside the address family:

0.0.0.0:22 : This is a listen socket which accepts connections on any interface, port 22 for IPv4 connections only.

[::]:22 : Same here, but for IPv6 connections.

LISTEN   0        128                    *:80                  *:*  

And this is a listen sockets which accepts IPv4 as well as IPv6 connection requests.