Quoting Bsd Neophyte (bsdneophyte@yahoo.com):
> okay, i know the title made NO sense.
>
> this is what's going on.
>
> i have adelphia cable.  they give you a dynamic ip by using DHCP, which

Weren't they put in jail? 

> renews every 2 minutes or so.  the odd thing is that the IP address never
> seems to change.

That's their DHCP being wrong.  You may be able to request a long lease.
My (ATT) experience is that in 6 months, I've got the lease I got
on day 1.

> anyways, i installed apache on my netbsd box.  i have a domain registered,
> now, i know there are dynamic ip services out there.  i want to know of a
> simple way to keep my ip address updated on their domain servers.
>
> does anyone have a simple way to do this?

Google will find you many scripts.
See also pkgsrc/net/ddclient

it took me 20 seconds of google for "dyndns bsd script" to find it,
but that's why I get the big bucks... (if anyone has big bucks for me,
let me know :)