10.0.0.138 — Cable Modem Status Page

What is 10.0.0.138?

10.0.0.138 is the long-standing diagnostic address for cable modems — most famously Arris and Motorola SURFboard units used on Comcast/Xfinity and other cable networks. Unlike a router admin page, 10.0.0.138 is mainly a read-only status page: it reports the modem's signal levels, connection state, and event logs rather than letting you change WiFi settings. It lives in the 10.0.0.0/8 private IPv4 range, the same family as the 10.0.0.1 gateway address many Xfinity routers use.

10.0.0.138 vs 10.0.0.1

This is the key distinction, and it trips up a lot of Xfinity users:

If you have a standalone modem plus your own router, 10.0.0.138 reaches the modem and your router lives at a separate address (often 192.168.1.1 or 10.0.0.1). If you have a combined Xfinity gateway, you'll usually manage everything at 10.0.0.1 or in the Xfinity app, and 10.0.0.138 may show a limited status view or not respond at all.

Which devices use 10.0.0.138

Note: many DOCSIS modems also expose the same status page at 192.168.100.1, which is the DOCSIS-standard diagnostic address. If 10.0.0.138 doesn't respond, try 192.168.100.1.

Finding your actual gateway when unsure

If you're not certain which IP to use, look up your gateway directly:

• Windows: Open Command Prompt and run ipconfig. The "Default Gateway" under your active adapter is your router's admin IP.
• Linux: Run ip route; the line starting "default via" shows the gateway.
• macOS: Run netstat -nr, or open System Settings → Network → WiFi → Details → TCP/IP and read the Router field.
• iPhone / iPad: Settings → WiFi → tap the (i) next to your network → Router.
• Android: Settings → Network & Internet → WiFi → tap your network → Advanced → Gateway.

How to open 10.0.0.138 — step by step

1. Connect to the modem's network — via WiFi or Ethernet. You must be on the same network. Mobile data or another network cannot reach the page.
2. Open a browser (Chrome, Firefox, Safari, Edge) and type http://10.0.0.138 in the address bar — not the search bar — then press Enter. Do not add www.
3. Read the status page. Many SURFboard modems open the diagnostic page with no login; some prompt for admin / password. Check the device sticker for any printed credentials.
4. For WiFi settings, switch to 10.0.0.1. The modem page is mostly read-only — to change WiFi or network settings on a combined gateway, open 10.0.0.1 or use the Xfinity app.

What the 10.0.0.138 status page shows

• Downstream power & SNR — receive signal strength and signal-to-noise ratio per channel; the most useful numbers for diagnosing a flaky connection.
• Upstream power — transmit levels back to the cable network.
• Connection state — whether the modem is ranging, registering, or fully online.
• Channel bonding — how many downstream/upstream channels are locked.
• Event log — timestamped errors that help pinpoint drops and outages.
• Firmware version — useful when contacting your ISP about a known issue.

"10.0.0.138 not working" — fixes

• Page won't load: Use http://10.0.0.138 — not https://. Then try http://192.168.100.1, the DOCSIS-standard status address.
• You have a combined gateway: Use 10.0.0.1 for router settings; 10.0.0.138 may not apply.
• Wrong IP: Use the gateway-finding steps above to confirm the real address.
• VPN active: Disconnect the VPN — it reroutes traffic and blocks local addresses.
• Browser extension: Open a private/incognito window; some privacy extensions block local IP access.
• Modem still booting: After a power cycle, wait until the modem's online light is solid before loading the page.

Using 10.0.0.138 to diagnose a slow or dropping connection

The status page is most valuable when your connection keeps dropping or runs slow. Check that downstream power sits roughly between -7 and +7 dBmV and that SNR is comfortably above 33 dB on each channel; values far outside those ranges point to a cabling or line problem your ISP needs to address. Pair the readings with a speed test to confirm whether the signal issue is actually costing you throughput, and check the event log for repeated "T3 timeout" or sync-loss errors.

Security note

The 10.0.0.138 status page is local-only and largely read-only, so there's little to misconfigure. If your device also acts as a router (a combined gateway), the security basics still apply: change any default admin password, keep firmware current, and use WPA3 or WPA2-AES for WiFi. See our 10.0.0.1 admin guide for the full gateway setup.