Xfinity IP Administration

Static address assignment

When a new device connects to the network it gets a new IP address assigned to it. Address assignment is done by the DHCP service which is typically located on a router (in large networks it could be located on a dedicated computer). The IP address returned by the DHCP is assigned to the device for a certain period of time. The procedure of IP address assignment is called DHCP lease. IP address is typically leased for a certain amount of time and is renewed automatically when it expires. When device disconnects from the network it may lose an IP address previously assigned to it and will need to request a new one from DHCP service. This is usually enough for most scenarios. But there are certain cases when automatic DHCP IP address assignment should not be used.

For example, when surveillance video recorder is installed it needs to know IP addresses of cameras which provide surveillance feed. If cameras get IP using DHCP service, then their IP addresses will not be constant. In this case surveillance video recorder will not know which IP address it needs to use to get the feed from cameras.

To solve the problem described above static IP address assignment is used. Devices which need to have a constant IP address on the network are assigned with a static IP address. This static IP address is not going to change after device reboots or reconnects to a network. To make sure that static IP address is not going to be duplicated by one from DHCP service different ranges of IP addresses is used for static IP addresses and DHCP. For example, DHCP service is typically configured to use IP addresses from to In such case static IP address should be assigned in a range from to or from to

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