How about using the "Internet Ports Database" at http://www.portsdb.org/ an 
example query:

http://www.portsdb.org/bin/portsdb.cgi?portnumber=4500&protocol=ANY

There's quite a few to choose from, taken from here:

http://www.chebucto.ns.ca/~rakerman/port-table.html

-- 
Steve-o

On 5/18/05, Peter Allgeyer <allgeyer at web dot de> wrote:
> 
> Am Mittwoch, den 18.05.2005, 00:25 -0400 schrieb Eric Cronin:
> > it is helpful to include a link to info the port in question, e.g.
> >
> > return $ip . ", port <a href='http://isc.sans.org/
> > port_details.html?port=" . $port . "'>" . $port . "</a>";
> 
> Interesting idea. But do you think that it's wise to link against an
> external (commercial) webpage?
> 
> Ciao ...
> ... PIT ...
> 
> 
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