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netstat -an|grep WXYZ:

tcp        0      0 0.0.0.0:WXYZ                0.0.0.0:*                   LISTEN
tcp        0      0 :::WXYZ                     :::*                        LISTEN

iptables -L -n -v:

2 96 ACCEPT     tcp  --  *   *   0.0.0.0/0         0.0.0.0/0           state NEW tcp dpt:22
0  0 ACCEPT     tcp  --  *   *   0.0.0.0/0         0.0.0.0/0           state NEW tcp dpt:WXYZ