This is off topic, pafoo, but I want to clairify this for you.
As stated earlier, there are (some would consider better) alternatives to logging IP changes, but the reason for wanting a system would be dynamic IP assignment. Some ISPs dynamically allocate IPs, This is very common with dial-up users and some internal organizations which act as ISPs {some colleges}. If you had a server on such a networked system, you would need to keep all references to the server current. Usually this is done by running a program of some sort which reports changes to another server - usually some dynamic dns service. Then the references (website, nameserver info etc) are set to point to the dns server which then points to (the current location of) your server.
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