Static IP can mean a fixed address inside your home network or a fixed public address from Comcast. Most home tasks, including printers, cameras, and port forwarding, only need the free local version.
Does this affect you?
Use this if you need one device on an Xfinity network to keep the same IP address, or if you are trying to host something reachable from the internet. The two setups are different, and choosing the wrong one creates unnecessary cost or complexity.
Reserve a fixed local IP address
This is free and handles most home needs.
- If you use the Xfinity Gateway, open the Xfinity app.
- Go to Wi-Fi > Devices and select the device that needs a stable address.
- Look for Advanced settings or Reserve this IP address. Wording can vary by app version.
- If you use your own router, log into that router admin page and open DHCP Reservation, Address Reservation, LAN, or Network Settings.
- Select the device from the connected device list or enter its MAC address manually.
- Choose an unused address in your local range, such as 192.168.1.50 if the network uses 192.168.1.x.
- Save, then restart or reconnect the device so it receives the reserved address.
Request a real public static IP from Comcast
Only do this when outside users or systems must reach your connection at the same public address.
- Check whether your Xfinity plan supports static public IP service. It is most commonly tied to Xfinity Business Internet.
- Contact Xfinity Business support or your account team and ask specifically about adding a static IP. Expect an added monthly cost.
- After Comcast assigns details, enter the provided IP address, subnet mask, gateway, and DNS details into the router WAN/Internet settings as instructed.
- If the Xfinity Gateway is in bridge mode, enter the static IP details on your own router, not on the gateway Wi-Fi settings.
More control
Local reservation is not public static IP
A DHCP reservation keeps a printer, camera, console, or server stable inside the house. It does not give your home a permanent address on the internet. Remote access may also need port forwarding or Dynamic DNS.
Pick addresses carefully
Check the router DHCP range before choosing a reserved address. Stay within the expected local range and avoid addresses already used by active devices.
Bridge mode changes where settings live
When the Xfinity Gateway is bridged, it behaves more like a modem. DHCP reservations, local IP rules, and port forwarding belong on your own router.
Sources
- Xfinity Support – Reserve an IP address in xFi (2025)
- Xfinity Business – Static IP addresses (2025)
- FCC Consumer Guide – Wireless Network Troubleshooting (2024)