You just need a dynamic DNS service, and there are none better in this reviewer's opinion than TZO.

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TZO Support faq for category: dns


Can I use TZO DNS service with third-party web or email hosting?
How come my IP address changed but I can still ping the old one with TZO?
What is DNS, DDNS and why would I need it?
When is an IP address 'WAN' or 'LAN', and what is the difference?
What type of Domains can I use with TZO Premier?
Can I add additional or backup MX records to my domain?
Do you offer Round Robin DNS Service?
How do I change my name servers through another Registrar?
Does TZO accept DNS zone transfers?
Can I use TZO for my domain even if my website or email is hosted elsewhere?
Why does my TZO client show my domain as “DOMAIN REMOVED”?
Will using WebRelay affect my site's indexing by search engines?
My domain's WHOIS record lists TZO servers, so why is my domain not active?
How do I verify my domain's MX record (receiving email)?
How do the page titles work with TZO Web Relay?
Why does my DNSReport show "Missing (Stealth) nameservers?
How do I use the Web Server SSI functions?