Solved how long is a dynamic IP address valid in the UK?

May 29, 2012 at 07:11:28
Specs: Windows 7
Does it last until you close your browser or is it removed after a certain time?

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#1
May 29, 2012 at 07:50:41
well it depends !! I mean Dynamic IP address generally are gone once u "disconnect from the internet" not "closing the browser" at times if you reconnect the internet again soon then you "MAY get" the same IP address.

Solving Technical queries is my passion and I just Love it !!


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#2
May 29, 2012 at 07:56:58
thanks buggsbunny for your quick reply. i note the distinction you make between closing the browser and disconnecting; thanks. Apparently in Germany a private IP address lasts a max 24 hours - i wonder if their internet connection gets cut at this point? Cheers, Stratford

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#3
May 29, 2012 at 08:05:53
✔ Best Answer
It all depends upon the server issuing the lease. It can last for hours or for years. With some ISPs (you don't only get dynamic addresses from ISPs) you will find that you almost always get the same address, even if you disconnect for a substantial time; with others you may get a new address every time you reconnect.

There are no rules, or laws, about this. From a legal point of view I expect that the powers that be would prefer us all to have unique, fixed addresses (which will happen when IPV6 becomes widespread).


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#4
May 29, 2012 at 11:35:57
A DHCP server will assign an IP address that is valid for the duration of the lease. There are no standards for this so an ISP could usually set the lease to any time they consider is appropriate.. But whatever the period may be the client would normally attempt to renew the lease long before it expires. These attempts would continue periodically until successful or the lease expires. As long as this is successful the IP address and Internet connectivity could usually be maintained indefinitely. Only in the event that a renewal of the lease failed would the IP address and network connectivity be lost.

That is how things usually works. For whatever reasons an ISP could choose to configure things differently.


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#5
May 30, 2012 at 01:12:22
Thanks everyone for your replies, which have been really helpful. We are interested in posting a pop-up banner on a website that displays only once to individuals (not companies) when they log on to our website. my fear is that their IP addresses will change each time they log on to the internet, and if they visit our site again, we'll annoy them with the same message. Clearly we dont want to do that. Any ideas?
Thanks again to anyone taking the time to reply.

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#6
May 31, 2012 at 16:50:20
That's what cookies were invented for!

Stuart


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