Added in 1.9.0
/socklisten [-dp] [bindip] <name> [port]
-d - Switch indicates that you specified an ip address as the bind address.
-p - Enables UPnP support for the listening socket, if that is available.
[bindip] - Ip address to bind to. (used with -d)
<name> - Name to give the listening connection.
[port] - Port to listen on.