Most likely those services run a redirector
on a web server that accepts requests for 
my.cooldomain.com and points browsers to 
an arbitrary URL that includes the port 
designation: "http://1.2.3.4:81/". I don't 
think it is a DNS thing.

>>> "Garrett Krueger" <gkrueger at cleosci.com> 07/26/04 03:50PM >>>
>If you have a domain name registered through some service (such as
domain
>monger), they probably have a separate entry for the port filled in with
a
>default value of 80.
>If you're doing it yourself, you could try:  192.168.1.2:81
>where you append the port number directly after the webserver's address.

>You would also have to remember to define this port entry in the
>httpd.conf file.
> chewie wrote:
>> Garrett Krueger wrote:
>>> You would need to include any non-standard (non port 80) port values
>>> in the DNS entry on your supporting name servers.
>> How do you put a port value in a Domain Name Service entry?  What kind
>> of record would that be?


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