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Bradley Mitchell

How to Keep the Same IP Address

By May 26, 2009

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Sometimes your computer's IP address may change when connecting to your home network, even though you haven't made any modifications to the setup. It happens more frequently if you have kept the computer shut off or away from home for awhile. This is an expected behavior of DHCP (which most home networks use) and usually nothing to be concerned about. Some people, however, like consistency and wish that their IP addresses would stay the same whenever possible.

Your network router (or other DHCP server) keeps track of how long ago it issued your computers their IP addresses. To make sure that the network does not run out of IP addresses, DHCP servers set a time limit called a lease for how long each computer can be guaranteed to keep their same address, after which the address will be re-assigned to the next device that tries to connect to it. Routers typically set a relatively short DHCP lease time limit like 24 hours but also allow administrators to change the default value. Shorter leases make sense on large networks with many devices connecting and disconnecting but generally aren't helpful on home networks. By changing your DHCP lease time to a longer value, you can increase the likelihood that each computer will keep its lease indefinitely.

Alternatively, with some more effort you can set up static IP addresses instead of using DHCP. Static addressing guarantees your computers will always use the IP address at home, but make it more difficult to move them to other networks.

Discuss - Is an IP Address Unique to all Networks?
Comments
June 2, 2009 at 6:15 pm
(1) stacey says:

Companies like Linksys also make certain routers that allow DHCP reservations to be assigned by MAC address.

April 19, 2014 at 9:54 am
(2) Printable subtraktion beløb og øvelser for børn says:

I do not leave a response, however I browsed some of the comments on How
to Keep the Same IP Address. I do have a few questions for you if it’s
okay. Is it simply me or do some of these remarks look as
if they are coming from brain dead folks? :-P And, if you are writing at
additional online social sites, I would like to keep up with anything fresh you have to post.
Could you post a list of every one of your social community pages like your twitter
feed, Facebook page or linkedin profile?

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