It's usually a virtual host/vhost, this is controlled by the IRC server operators, often done to mask their connecting IP (..sometimes assigned by services, i.e: after identifying/authenticating).
You can either ask them to do this for you, or, as I mentioned in your previous topic here.. ask your ISP if switching to a business tier will allow them to assign a custom PTR record for your IP.
Generally the first option is easier, if they're your friends, justifying the PTR record to an ISP is often difficult.. and some have no procedure to change it for customers.
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