The whole idea of fixed ports is broken. The idea that there are only 1024 or even 65535 Internet applications is broken. The Internet has a signalling layer, the DNS. Applications should use it. The SRV record provides an infinitely extensible mechanism for advertising ports. Fixed ports do not work behind NAT. Anyone who wants to deploy IPv6 would be well advised to pay careful attention to that restriction. SRV ports work just fine behind a NAT. IANA should be told to close the well known ports registry. Applications should use DNS SRV records for service location.
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