192.168.100.20 Admin Login

192.168.100.20 is a Class C private IPv4 address belonging to the 192.168.100.0/24 subnet — a range closely associated with ISP-provisioned cable modems, modem-router combos, and broadband gateway devices from manufacturers such as ARRIS, Motorola, Huawei, and Zyxel. Unlike the more familiar consumer subnets such as 192.168.1.254 or 192.168.0.1, the 192.168.100.x range is predominantly used by ISP-deployed hardware to avoid IP conflicts with customer-owned routers placed downstream. The primary default gateway in this subnet is 192.168.100.1, and 192.168.100.20 is the twentieth host address within the same range. It is typically assigned to a connected device via DHCP, or manually configured as a static IP for a specific device such as a network printer, IP camera, NAS drive, or managed switch. In some network setups — particularly those involving ISP-supplied gateways from ARRIS (e.g., TG1672G, TG1682G), Motorola (e.g., SBG940, MG7700), Huawei ONT gateways, or Zyxel DSL modem-routers — 192.168.100.20 may also appear as a DHCP-leased address assigned to your computer or another device on the local network.

How to Access 192.168.100.20

To access a device or admin panel at 192.168.100.20, open your preferred web browser — Chrome, Firefox, Edge, or Safari — and type http://192.168.100.20 directly into the address bar, then press Enter. Do not type it into a search engine, as that will return search results rather than your device's login page. If 192.168.100.20 has been configured as the admin interface of a device on your network, you will be presented with a login prompt asking for a username and password.

Because 192.168.100.20 is a private IP address, it is only reachable from within your local network. You must be connected to the same network — either via Wi-Fi or a wired Ethernet cable — as the device using this address. If you are trying to reach your ISP-supplied gateway (such as an ARRIS, Motorola, Huawei, or Zyxel modem-router), note that the default admin interface is most commonly found at 192.168.100.1, not at 192.168.100.20. However, if a network administrator or ISP technician has manually assigned 192.168.100.20 as the management address of a specific device, you can reach it using the steps above.

Once logged in, you will have access to your device's configuration panel, where you can adjust Wi-Fi settings, manage connected devices, configure port forwarding, update firmware, and more — depending on the device type and manufacturer.

If You Can't Access 192.168.100.20

If entering http://192.168.100.20 into your browser does not load a login page, there are several possible reasons and solutions to try:

• Wrong gateway address: 192.168.100.20 is a host address, not a default gateway. If you are trying to reach your router or modem's admin panel, the correct address is most likely 192.168.100.1 for ARRIS, Motorola, Huawei, and Zyxel devices. Try that address first.
• Not on the same subnet: Your computer must be on the 192.168.100.x subnet to reach 192.168.100.20. Open Command Prompt (Windows: Start > cmd, then type ipconfig) or Terminal (Mac/Linux: type ifconfig or ip a) and check your current IP address. If your IP starts with 192.168.1.x or 192.168.0.x, you are on a different subnet and cannot directly reach 192.168.100.20 without reconfiguring your network.
• No device assigned to this address: If no device on your network has been assigned or configured to use 192.168.100.20, the address will be unreachable. Check your router's DHCP client list to see which addresses are currently in use.
• Browser cache or HTTPS issue: Try clearing your browser cache or prefixing the address with http:// (not https://), as most router admin panels do not use SSL by default.
• Firewall blocking access: Some ISP-provisioned gateways, particularly those from Huawei and ARRIS, include built-in firewall rules that may restrict access to certain host addresses. Check your gateway's firewall settings at 192.168.100.1.

If you are still unable to connect, use our guide to find your router IP address and confirm the correct admin address for your specific device.

Router Brands That Use the 192.168.100.x Subnet

While 192.168.100.20 is not itself a default gateway address, it belongs to the 192.168.100.0/24 subnet that is strongly associated with a specific group of ISP-provisioned hardware manufacturers. Understanding which brands operate in this subnet helps you identify your device and locate the correct admin interface. The following brands are known to use the 192.168.100.x range:

• ARRIS — ARRIS modem-router combos including the TG1672G, TG1672G6, TG1682G, SBG6700-AC, and SBG8300 series commonly use 192.168.100.1 as their default gateway. Devices connected to these gateways — such as your computer or a network printer — may receive addresses like 192.168.100.20 via DHCP. ARRIS hardware is widely deployed by ISPs including Comcast/Xfinity, Cox, and Spectrum.
• Motorola — Motorola cable modems and modem-router gateways such as the SBG940, SURFboard SBG940, MG7700, MG8702, and MT7711 series use 192.168.100.1 as the default admin IP. Connected devices on these networks are assigned addresses in the 192.168.100.x range, including 192.168.100.20.
• Huawei — Huawei broadband gateways and ONT (Optical Network Terminal) devices deployed by ISPs across Asia, Europe, and the Middle East frequently operate on the 192.168.100.x subnet. Huawei uses this range specifically to avoid conflicts with customer-owned routers that typically default to 192.168.1.x.
• Zyxel — Zyxel DSL modem-routers and ISP-provisioned gateways also operate within the 192.168.100.x subnet, with 192.168.100.1 as the primary admin interface. Zyxel devices are commonly deployed by European and Asian ISPs.

If your device received 192.168.100.20 as its IP address, it is very likely connected to one of the above gateway types. Your router's admin panel is accessible at 192.168.100.1.

Changing Your Router's Password

If your network operates on the 192.168.100.x subnet — as is common with ARRIS, Motorola, Huawei, and Zyxel modem-router combos — it is critical that you change your router's default admin password as soon as possible after setup. The default credentials for these devices are publicly documented and widely known, making your network vulnerable to unauthorized access if left unchanged.

To change your password, navigate to your router's admin panel at 192.168.100.1 and log in using the default credentials printed on your device's label (commonly admin / password, admin / admin, or cusadmin / highspeed for ARRIS devices). Once logged in, look for the Administration, Management, or Security section of the interface. From there, select the option to change your admin password. You will typically be prompted to enter your current password and then type your new password twice for confirmation.

Choose a strong password that is at least 12 characters long and includes a mix of uppercase letters, lowercase letters, numbers, and special characters. Avoid using easily guessable information such as your address, name, or ISP account number. Once saved, you will need to use your new password every time you access the admin panel at 192.168.100.1 from a device on the 192.168.100.x subnet, including from 192.168.100.20.

Router Username and Password List

Factory Reset Procedures for 192.168.100.x Devices

If you have forgotten your admin password or can no longer access your router's settings panel, performing a factory reset will restore the device to its default configuration — including the default gateway address (192.168.100.1) and the original login credentials. Below are the factory reset procedures for the major brands that operate on the 192.168.100.x subnet:

• ARRIS — Locate the Reset button on the back or bottom of your ARRIS modem or gateway (e.g., TG1672G, TG1682G, SBG8300). Use a paperclip or pin to press and hold the Reset button for 10–15 seconds until the device's indicator lights flash or cycle through a restart sequence. The modem will reboot and restore factory settings, including the default gateway at 192.168.100.1. Default credentials are typically printed on the device label — commonly admin / password or cusadmin / highspeed.
• Motorola — On Motorola cable modems and modem-router combos (e.g., SBG940, MG7700, MG8702), press and hold the Reset button on the rear panel for at least 10 seconds. Release when the Power LED begins to flash. The device will restart and return to its factory configuration with the 192.168.100.x subnet active and 192.168.100.1 as the admin gateway. Default credentials are usually admin / motorola or as printed on the label.
• Huawei — On Huawei ONT gateways and broadband routers, press and hold the Reset button (often labeled RST) for 10–20 seconds using a pin or paperclip. The device will reboot and restore factory defaults. The default username is typically admin and the default password is admin or as specified by your ISP.
• Zyxel — On Zyxel DSL modem-routers, press and hold the Reset button on the rear panel for 10 seconds until the Power LED flashes. The device will reboot and restore factory settings. Default credentials are typically admin / 1234 or as printed on the device label.

After performing a factory reset, any custom settings — including your Wi-Fi network name (SSID), Wi-Fi password, port forwarding rules, and static IP assignments (such as 192.168.100.20) — will be erased. You will need to reconfigure your network from scratch.

What is 192.168.100.20 Used For?

192.168.100.20 is a private Class C IPv4 address in the 192.168.100.0/24 subnet. As a host address — rather than a gateway address — it has several practical uses within a local network:

• DHCP-assigned device address: The most common scenario is that your ISP-supplied gateway (ARRIS, Motorola, Huawei, or Zyxel) has automatically assigned 192.168.100.20 to one of your connected devices — such as your laptop, smartphone, smart TV, or gaming console — via DHCP. This is a temporary assignment that may change each time the device reconnects to the network.
• Static IP for a network device: Network administrators often assign 192.168.100.20 as a fixed (static) IP address to a specific device that needs a permanent, predictable address on the network. Common examples include network printers, IP cameras, NAS (Network Attached Storage) drives, VoIP phones, and managed switches. Assigning a static IP ensures the device is always reachable at the same address.
• DHCP reservation: Rather than setting a static IP directly on the device, you can configure your router at 192.168.100.1 to always assign 192.168.100.20 to a specific device based on its MAC address. This is known as a DHCP reservation or IP binding, and it combines the convenience of DHCP with the predictability of a static IP.
• Secondary admin interface: In some advanced network configurations, 192.168.100.20 may be assigned as a secondary management IP for a network device such as a managed switch or access point, allowing administrators to reach it at a known address within the 192.168.100.x subnet.

Regardless of how 192.168.100.20 is being used on your network, it is important to ensure that only one device is assigned this address at any given time. Assigning the same IP to two devices simultaneously will cause an IP address conflict, resulting in connectivity issues for both devices.

Related IP Addresses in the 192.168.100.0/24 Subnet

The 192.168.100.0/24 subnet contains 254 usable host addresses, ranging from 192.168.100.1 to 192.168.100.254. Several addresses within this range are commonly used as default gateways or admin interfaces by ISP-provisioned hardware. If 192.168.100.20 is not the correct address for your device, one of the following may be:

• 192.168.100.1 — The most common default gateway in the 192.168.100.0/24 subnet, used by ARRIS, Motorola, Huawei, and Zyxel devices. This is the first address you should try when accessing your modem-router's admin panel.
• 192.168.100.2 – 192.168.100.19 — Host addresses in the lower range of the subnet, typically assigned by DHCP to connected devices or reserved for static assignment to specific network equipment.
• 192.168.100.21 – 192.168.100.253 — Additional host addresses available for DHCP assignment or static configuration within the same subnet.
• 192.168.100.254 — The highest usable host address in the subnet, used as the default gateway by select devices including certain Arris SBX-1000P small business gateways and some ISP-provisioned routers.

If you are unsure which address to use, the fastest way to find your correct gateway is to open Command Prompt on Windows (Start > cmd, then type ipconfig) and look for the Default Gateway value. On Mac or Linux, open Terminal and type netstat -nr | grep default or ip route | grep default. You can also check our full guide to find your router IP address.

Other commonly used private IP addresses outside this subnet include 192.168.0.1, 192.168.1.254, 192.168.8.1, 192.168.10.1, and 10.0.0.1.

Frequently Asked Questions About 192.168.100.20

Is 192.168.100.20 a default router gateway?

No. 192.168.100.20 is not a default gateway address for any known router brand. It is a host address within the 192.168.100.0/24 subnet. The default gateway for this subnet — used by ARRIS, Motorola, Huawei, and Zyxel devices — is 192.168.100.1. If your device has been assigned 192.168.100.20, it means your network's gateway is operating on the 192.168.100.x subnet and your device received this address via DHCP or static assignment.

Why does my device have the IP address 192.168.100.20?

Your device was assigned 192.168.100.20 by your router or modem's DHCP server. This is normal behavior on networks that use ISP-provisioned hardware from brands like ARRIS, Motorola, Huawei, or Zyxel, all of which operate on the 192.168.100.x subnet. The address 192.168.100.20 is the twentieth host address in the range and was simply the next available address when your device connected to the network.

Can I use 192.168.100.20 as a static IP for my device?

Yes. You can manually assign 192.168.100.20 as a static IP address to any device on your network, as long as no other device is already using it. To do this, either configure the static IP directly in your device's network settings, or set up a DHCP reservation in your router's admin panel at 192.168.100.1 to always assign 192.168.100.20 to a specific device based on its MAC address. Static assignment is particularly useful for network printers, IP cameras, and NAS devices that need a consistent, predictable address.

How do I log in to my router if my IP is 192.168.100.20?

If your device's IP address is 192.168.100.20, your router's admin panel is most likely accessible at 192.168.100.1. Open your browser and navigate to http://192.168.100.1. For ARRIS devices, try the credentials admin / password or cusadmin / highspeed. For Motorola devices, try admin / motorola. For Huawei and Zyxel devices, check the label on the back or bottom of your device for the default username and password.

What should I do if there is an IP conflict at 192.168.100.20?

An IP address conflict at 192.168.100.20 occurs when two devices on your network are assigned the same address simultaneously. To resolve this, log in to your router's admin panel at 192.168.100.1 and check the DHCP client list to identify which devices are using 192.168.100.20. If you have manually assigned this address as a static IP to a device, ensure no other device is configured with the same address. You can also expand your DHCP pool or adjust the DHCP lease range to prevent future conflicts on the 192.168.100.x subnet.

Is 192.168.100.20 safe to use on my network?

Yes. 192.168.100.20 is a private IP address defined under RFC 1918 and is only accessible within your local network. It cannot be reached from the internet, which means it poses no inherent security risk simply by existing on your network. However, if a device at 192.168.100.20 is running an admin interface or web server, you should ensure it is protected with a strong password to prevent unauthorized access from other devices on the same 192.168.100.x subnet.