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I'm no expert on this, but I've used no-ip.com's DNS features to convert a "sub-domain" url to a url with a port, e.g. sub.domain.com is translated by the DNS to domain.com:1000.
Hmmm... I've studied DNS fairly in-depth, and although there was at one time a specification for looking up ports via DNS, nobody used it. In any case, DNS wouldn't take a domain name and return a port, you'd have to supply a service to look up. Remember, DNS is not HTTP-specific, it doesn't know what you're planning to use the domain name for.
More likely, what you're seeing is a two-step process where it first looks up the IP address, then the HTTP server on that IP address provides a re-direct to the given port number.
If that's the case, it's not pure DNS. It's a combination of DNS to get the IP address, and HTTP to send a re-direct.
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