Support XFINITY Internet Release and Renew Your IP Address


When you connect your computer directly to your cable modem, you’re given a unique IP (Internet Protocol) address assigned by a Dynamic Host Configuration Protocol (DHCP) server. This is essentially your address on the Internet. Your IP address doesn’t change often, but there will be times when you’ll be assigned a short-term DHCP lease and will need to release and renew your IP address before you can reconnect to the Internet.

Why Was I Assigned a Short-term DHCP?

You may have been assigned a short-term DHCP lease for a number of reasons:

  • You connected a new device, such as a computer, or a computer with a new network interface card, to the cable modem for the first time.
  • You turned on your computer for the first time in a very long time, and the DHCP server interprets it as a new connection.
  • The device connected to the cable modem isn’t configured to DHCP. You’ll need to obtain DHCP configuration instructions for your router from its manufacturer. Check out DHCP configuration instructions for all supported Windows Operating Systems.
  • We are performing maintenance on the DHCP servers or elsewhere on our network.
  • The device connected to the cable modem is not functioning properly.

A properly configured device - regardless of the length of its lease - automatically renews its DHCP lease when the current one expires. This shouldn’t cause an interruption in service. Occasionally, you’ll have to manually release and renew your IP address. (This may happen when there’s been a power outage, you’ve moved your computer, bought a new router, or reconfigured your home network.) Find your operating system below and follow the steps as directed.

Windows Vista, Windows 7 and Windows 8

  1. Click Start and type CMD in the search box. Then click OK.
    Run window opens and cmd is typed in the Open field. Click OK.
  2. Type ipconfig /release and then press the Enter key on your keyboard.
    In Console Command Window, type ipconfig/release
  3. Type ipconfig /renew and then press Enter.
    In Console Command Window, on the line below Connection-specific DNS suffix,  type ipconfig/renew


Mac OS X Yosemite, Mac OS X Mavericks and Mac OS X Mountain Lion

  1. Close any open Internet applications (web browsers, email, etc.).
  2. Choose System Preferences from the Apple menu, then click Network.
  3. Select your service that uses DHCP (such as Ethernet or WiFi) in the network connection services list.
  4. Click Advanced.
  5. Click TCP/IP.
  6. Click Renew DHCP Lease.
  7. Open a web browser and attempt to connect to the Internet.

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