WWW FAQs: What is a dynamic IP address?


2006-11-26: A dynamic IP address is a TCP/IP protocol address which is assigned on the spot when you "dial in" to your dialup, cable modem, DSL, or other Internet service provider.

If your ISP provides dynamic IP address service, you can expect your IP address to change each time you reconnect.

Contrary to popular belief, you do not need a static IP address in order to run a server on your own computer. Dynamic DNS services provide a way to give your computer an Internet hostname that does not change, such as example.is-a-geek.com. These services automatically update the IP address that corresponds to your hostname every time your IP address changes. For more information about dynamic DNS services, see my article how do I get a hostname for my own computer?

See also what is TCP/IP, what is a protocol, what is a static IP address, what is an IP address, should I host my own web server at home, how do I host my own web server at home.

Legal Note: yes, you may use sample HTML, Javascript, PHP and other code presented above in your own projects. You may not reproduce large portions of the text of the article without our express permission.

Got a LiveJournal account? Keep up with the latest articles in this FAQ by adding our syndicated feed to your friends list!