http://en.wikipedia.org/wiki/Ipv6
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What does this have to do with ZSNES?
Well, you need an IP address for netplay, obviously. The problem is that Zsnes Netplay currently uses IPV4 which will soon be running out of addresses.
For those of you unfamiliar with networking, IPV4 addresses generally look like this: 12.10.254.1, while IPV6 addresses consist of hexidecimal - [2001
I know that IPV6 implementation is currently very preliminary and that Internet Service Providers like Comcast and Verizon (in the USA anyway) are still testing it, but ZSNES should at least begin looking into how to implement it, once ZSNES's netcode has been sorted out.