Why Do IP Addresses Change ?

[Venomx]

Every time i reboot my router my IP address changes, why is this ?

[imjolly]

residentila ip address are dynamic and change as you can see  you need a business connection to get a fixed ip address

[Techwizz]

Because the router has a DHCP server which lends out addresses. Each time the router is rebooted, the DHCP table is reset and new addresses are issued. Sometimes the same address can't be given twice.

[Keith_Beddoe · Accepted solution]

Because its dynamically assigned from a number of IP ranges assigned to BT retail. There are not enough IPv4 IP adresses to give everyone their own IP address.

The answer is not to reboot the home hub,

[Keith_Beddoe]

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@Techwizz wrote:
Because the router has a DHCP server which lends out addresses. Each time the router is rebooted, the DHCP table is reset and new addresses are issued. Sometimes the same address can't be given twice.

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The home hub`s DHCP table is not reset, which is one of the faults of the home hub.

[Venomx]

Thanks @Keith_Beddoe

My HomeHub 6 reboots every 14 days and has done for the past two years :?

[imjolly]

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@Venomx wrote:

Thanks @Keith_Beddoe

My HomeHub 6 reboots every 14 days and has done for the past two years :?

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mine used to do that as well and only comfort I can give that it just stopped all of a sudden     my last reset due to firmware update I had 50+ days stable

[mike50501]

Shouldn't  make any difference to your use of the internet in most circunstances, but another reason I like to use my own router and set static IP addresses for my devices. 

[licquorice]

Static addresses are set on devices themselves. Address reservation is where a router gives the same IP address to a given MAC address via DHCP. Address reservation is available on home hubs. Address reservation is often misnamed static addressing.

[Keith_Beddoe]

@mike50501

I think @Venomx is talking about the Public Internet IP address, not the local LAN IP address, which can be fixed.