When I attempt to use my server's public IPv6 ip address as an option for the script, I get the following error:

Use of uninitialized value in subroutine entry at /usr/local/bin/wakeonlan line 75.
Bad arg length for Socket::pack_sockaddr_in, length is 0, should be 4 at /usr/local/bin/wakeonlan line 75.

It looks as though using the IPv6 ip is not supported by the script at this time. Is that a feature that needs to be added, or am I using the script incorrectly?

Note: The script works correctly when using no ip_address argument or my local ip address