10.0.0.138 Setup and Default Login Guide
Complete guide on how to log into your router or modem at 10.0.0.138. View default usernames, passwords, and devices associated with 10.0.0.138.
10.0.0.138 is a private gateway IP address used to open the admin panel of many routers and modems, including SMC, Arris. To log in, type http://10.0.0.138 into your browser and enter the device's admin username and password.
Which routers use 10.0.0.138?
10.0.0.138 is the local management address of cable modems and gateways made by SMC, Arris. It usually stays reachable even when the internet connection is down, which makes it useful for diagnostics.
Commonly deployed by Comcast, Xfinity.
Default logins for 10.0.0.138
| Username | Password | Applies to |
|---|---|---|
| cusadmin | highspeed | — |
| cusadmin | password | — |
| admin | admin | — |
Change the default password immediately after your first login. Factory credentials are public knowledge and are the first thing an attacker tries.
What Is 10.0.0.138?
10.0.0.138 is a private IPv4 address — Private (RFC 1918) — 10.0.0.0/8. Private addresses are not routable on the public internet — they are used inside home and office networks behind a router that performs NAT (Network Address Translation).
Subnet Details
- Address class
- Private (RFC 1918) — 10.0.0.0/8
- CIDR prefix
- /24
- Subnet mask
- 255.255.255.0
- Network address
- 10.0.0.0
- Broadcast address
- 10.0.0.255
- First usable host
- 10.0.0.1
- Last usable host
- 10.0.0.254
- Total addresses
- 256
- Usable hosts
- 254
How to login to 10.0.0.138
Open your favorite web browser (Chrome, Firefox, Safari, Edge).
Type http://10.0.0.138 into the URL address bar at the top and press Enter.
A login prompt will appear. Find your device in the table below and try the default username and password combinations.
If you cannot connect, ensure you are connected to the router's WiFi network or via Ethernet cable.
Why Does My Router Use 10.0.0.138?
Most home routers ship with a default LAN IP address chosen by the manufacturer. 10.0.0.138 is a common default — when you plug in a router and connect a device, the router hands out IP addresses inside the same range using DHCP.
Different manufacturers prefer different defaults: many TP-Link, Linksys, and Netgear models use 192.168.1.1, while D-Link historically used 192.168.0.1 and many fiber ONTs use 192.168.100.1. The router's IP and the addresses it hands out always belong to the same private subnet.
You will not see 10.0.0.138 on the public internet. When you visit a website, the router rewrites the source address to your public IP (assigned by your ISP) and translates replies back to your internal device. This is how dozens of devices share a single internet connection.
Devices using 10.0.0.138
| Brand | Model | Username | Password | Protocol |
|---|
How to See Other Devices on the 10.0.0.138 Network
- Windows: On Windows, open Command Prompt and run arp -a to list every device your computer has recently talked to, along with their IP and MAC addresses.
- macOS / Linux: On macOS or Linux, run arp -a in Terminal. For a deeper scan you can use nmap -sn 192.168.1.0/24 (replace the range to match your subnet).
- iOS / Android: On iOS and Android, install a free network scanner such as Fing. It walks the local subnet and shows every connected phone, laptop, smart TV, and IoT device.
- Router admin: Inside the router admin panel itself, look for "DHCP Clients", "Connected Devices", or "Device List". Most routers show every active lease with its hostname and MAC address.
How to Change Your Router's IP from 10.0.0.138
Changing the router LAN IP is useful when two networks overlap (for example, when bridging a home network into an office VPN). Before starting, note your current IP — you will need to log back in afterward.
- Log into the router admin panel using 10.0.0.138 and the default credentials from the table above.
- Navigate to "LAN", "Network Settings", or "Local Network" in the side menu.
- Change the LAN IP (for example, from 192.168.1.1 to 192.168.5.1) and update the DHCP range so it stays inside the new subnet.
- Save the settings. The router will reboot. Reconnect to the Wi-Fi and use the new IP to log back in.
After changing the LAN IP, the previous 10.0.0.138 address will no longer reach the admin panel. Bookmark the new address.
Subnet Calculator
Enter an IPv4 address and CIDR prefix to compute the network details.
- Subnet mask
- 255.255.255.0
- Network address
- 10.0.0.0
- Broadcast address
- 10.0.0.255
- First usable host
- 10.0.0.1
- Last usable host
- 10.0.0.254
- Total addresses
- 256
- Usable hosts
- 254
Frequently asked questions
How do I log in to 10.0.0.138?+
Connect to the router's network, open a browser and go to http://10.0.0.138. Enter the admin username and password (commonly cusadmin / highspeed). If the page does not load, confirm you are on the right network and that the gateway really is 10.0.0.138.
What is the default username and password for 10.0.0.138?+
The most common default login for devices on 10.0.0.138 is username "cusadmin" and password "highspeed". Credentials vary by brand and model — check your specific device below and change them after first login.
Why can't I access 10.0.0.138?+
The usual causes: you are not connected to that router's network, the gateway is a different IP, you typed https:// instead of http://, or a VPN/proxy is intercepting the request. Try another browser and disable any VPN.
Which brands use 10.0.0.138 as the default IP?+
SMC, Arris are among the manufacturers that ship devices with 10.0.0.138 as the default gateway.
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