192.168.100.18 Admin Login

192.168.100.18 is a private Class C IPv4 address that belongs to the 192.168.100.0/24 subnet — a range widely associated with ISP-provisioned cable modems and combo modem-router gateways from manufacturers such as ARRIS, Motorola, Huawei, Zyxel, Ambit Microsystems, and Ubee. While the default gateway in this subnet is typically 192.168.100.1, the address 192.168.100.18 is most commonly assigned to a client device — such as a laptop, smartphone, smart TV, or networked printer — by the DHCP server running on your cable modem or gateway. It can also be manually configured as a static IP for a specific device on your local network. Because it is a private address defined under RFC 1918, 192.168.100.18 is never routable on the public internet and is only reachable from within your local network. Other commonly used default gateways in related subnets include 192.168.1.254 and 192.168.0.1.

How to Access 192.168.100.18

To reach a device configured at 192.168.100.18, open your web browser and type http://192.168.100.18 directly into the address bar — not the search bar. This will attempt to load the administration or management interface of whatever device has been assigned this address on your local network. This could be a networked printer, a managed switch, a secondary access point, a NAS device, or any other network-connected hardware that exposes a web-based control panel.

For this to work, your computer or device must be connected to the same 192.168.100.0/24 network. If your own device has an IP address in a different subnet (for example, 192.168.1.x), you will not be able to reach 192.168.100.18 without adjusting your network settings. You can verify your current IP address and subnet by opening a command prompt (Windows: Start > cmd > ipconfig, Mac/Linux: Terminal > ifconfig or ip a) and checking the IPv4 address listed for your active network adapter.

If you are trying to access your cable modem or gateway's admin panel and your device has been assigned 192.168.100.18 via DHCP, your router's admin interface is most likely located at 192.168.100.1 — the standard default gateway for this subnet used by ARRIS, Motorola, Huawei, Zyxel, and Ubee devices.

Which Brands and Devices Use the 192.168.100.x Subnet?

The 192.168.100.0/24 subnet that contains 192.168.100.18 is strongly associated with ISP-issued cable modems and combo gateway devices. Unlike the more consumer-facing 192.168.1.x or 192.168.0.x subnets, the 192.168.100.x range is specifically favored by ISPs and their hardware partners to reduce conflicts with downstream routers. The following brands are known to operate within this subnet:

• ARRIS — Models such as the TG1672G, TG1672G6, and various Touchstone series gateways use 192.168.100.1 as their default gateway, placing all DHCP-assigned devices (including 192.168.100.18) within this subnet.
• Motorola — The SBG940 and SURFboard SBG940 are well-documented examples of Motorola cable modems that default to the 192.168.100.x range.
• Huawei — Several Huawei home gateway and ONT (Optical Network Terminal) devices provisioned by ISPs in Asia, the Middle East, and Africa use the 192.168.100.x subnet.
• Zyxel — Zyxel cable modem-router combos deployed by ISPs in Europe and Southeast Asia frequently operate in the 192.168.100.x range.
• Ambit Microsystems — Ambit cable modems, often deployed under ISP branding, are known to use 192.168.100.1 as their gateway, making 192.168.100.18 a valid DHCP client address on those networks.
• Ubee — Ubee interactive cable modems and gateways, commonly deployed by Comcast, Spectrum, and other North American ISPs, also operate in the 192.168.100.x subnet.

If your device has been assigned 192.168.100.18, it is very likely that your home or office network is running on one of the above ISP-provisioned gateways. You can confirm this by checking your default gateway address — if it reads 192.168.100.1, you are on one of these networks.

If You Can't Access 192.168.100.18

If typing http://192.168.100.18 into your browser does not load anything, there are several possible explanations:

• No device is assigned this IP: The address 192.168.100.18 may simply not be in use on your network. Your DHCP server (typically your ARRIS, Motorola, Huawei, Zyxel, or Ubee gateway) may not have assigned this address to any device yet. Check your router's connected device list at 192.168.100.1 to see which IPs are currently active.
• You are on a different subnet: If your own device's IP address starts with 192.168.1.x, 192.168.0.x, or any other prefix, you are not on the same subnet as 192.168.100.18 and cannot reach it directly. Use the ipconfig (Windows) or ifconfig (Mac/Linux) command to verify your current IP and gateway.
• The device at this IP has no web interface: Not every device that gets assigned 192.168.100.18 will have a browser-accessible admin panel. Smartphones, laptops, and tablets receive IPs via DHCP but do not host web interfaces.
• A firewall is blocking access: Some ISP-provisioned gateways, particularly those from Huawei and ARRIS deployed by Comcast/Xfinity or Spectrum, include firewall rules that restrict access to certain local IPs. Check your gateway's firewall settings at 192.168.100.1.
• Wrong address bar vs. search bar: Make sure you are typing the IP into the browser's address bar at the very top of the window, not into a search engine's search box. Entering an IP into a search bar will return search results, not a device login page.

If you are unsure of your correct gateway, visit our guide to find your router IP address.

Setting 192.168.100.18 as a Static IP Address

One of the most practical uses of 192.168.100.18 is assigning it as a static (fixed) IP address to a specific device on your network. By default, your ARRIS, Motorola, Huawei, Zyxel, Ambit, or Ubee gateway assigns IP addresses dynamically via DHCP, meaning a device's IP can change each time it reconnects. Assigning a static IP of 192.168.100.18 ensures that a particular device — such as a network printer, NAS drive, IP camera, or smart home hub — always gets the same address, making it easier to access and manage.

There are two ways to assign 192.168.100.18 as a static IP:

• DHCP Reservation (recommended): Log in to your gateway's admin panel at 192.168.100.1, navigate to the DHCP or LAN settings section, and create a reservation that ties the MAC address of your target device to the IP address 192.168.100.18. This way, the device always receives the same IP without any manual configuration on the device itself.
• Manual Static IP on the device: Go into the network settings of the device you want to assign 192.168.100.18 to, switch from DHCP to manual/static, and enter the following: IP Address: 192.168.100.18, Subnet Mask: 255.255.255.0, Default Gateway: 192.168.100.1, DNS: 8.8.8.8 (Google) or 1.1.1.1 (Cloudflare).

Be sure that 192.168.100.18 is not already in use by another device on your network before assigning it statically, as duplicate IPs will cause an IP address conflict and disrupt connectivity for both devices.

Changing Your Router's Password on the 192.168.100.x Network

If your network is running on an ARRIS, Motorola, Huawei, Zyxel, Ambit, or Ubee gateway that uses the 192.168.100.x subnet, it is critically important to change the default admin password. Many of these ISP-provisioned devices ship with well-known default credentials (such as admin/admin, admin/password, or credentials printed on a label), making them vulnerable to unauthorized access if the password is never changed.

To change your password, navigate to 192.168.100.1 in your browser, log in with your current credentials, and look for the Administration, Management, or Security section of the interface. From there, you will find an option to update the admin password. Choose a strong, unique password of at least 12 characters that combines uppercase and lowercase letters, numbers, and symbols. You should also change your Wi-Fi password (WPA2/WPA3 key) from the Wireless settings section if you have not already done so.

Router Username and Password List

Factory Reset Procedures for Devices on the 192.168.100.x Subnet

If you have lost access to the admin panel of your gateway and your network is operating in the 192.168.100.x range (with 192.168.100.18 as a client address), you may need to perform a factory reset. Here are the reset procedures for the most common brands associated with this subnet:

• ARRIS (TG1672G, Touchstone series): Locate the small recessed Reset button on the back or bottom of the device. Using a paperclip or pin, press and hold the button for 15–30 seconds until the device's lights flash and it reboots. After the reset, the gateway will return to its factory default settings, and the admin panel will be accessible at 192.168.100.1 with the default credentials printed on the device label.
• Motorola (SBG940 and similar): Press and hold the Reset button on the rear panel for at least 10 seconds. The device will reboot and restore factory defaults. The default gateway will return to 192.168.100.1.
• Huawei (ISP-provisioned gateways): Hold the Reset button (usually labeled RST) for 10 seconds until the indicator lights change. Note that some ISP-locked Huawei devices may require ISP intervention to fully reset, as certain settings are remotely provisioned.
• Zyxel (cable modem-router combos): Press and hold the Reset button for 10 seconds. The device will reboot and restore all settings to factory defaults, including the 192.168.100.1 gateway address.
• Ubee (ISP-deployed gateways): Use a pin to press and hold the Reset button on the rear of the unit for 10–15 seconds. After rebooting, the device returns to factory defaults with 192.168.100.1 as the gateway.

After any factory reset, remember to reconfigure your Wi-Fi network name (SSID), Wi-Fi password, and admin password immediately to secure your network.

What Is a Private IP Address Like 192.168.100.18?

192.168.100.18 is a private IPv4 address defined under RFC 1918, which reserves three address ranges exclusively for use within private local area networks (LANs): 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. The address 192.168.100.18 falls within the last of these ranges and is part of the 192.168.100.0/24 subnet, which supports up to 254 usable host addresses (192.168.100.1 through 192.168.100.254).

Because it is a private address, 192.168.100.18 is never visible on the public internet. Your ISP-provisioned gateway — whether it is an ARRIS, Motorola, Huawei, Zyxel, Ambit, or Ubee device — uses Network Address Translation (NAT) to map all private addresses on your local network (including 192.168.100.18) to a single public IP address when communicating with the internet. This is what allows multiple devices in your home or office to share one internet connection.

Within your local network, every connected device receives its own private IP address from the DHCP server on your gateway. For example, on a typical 192.168.100.x network:

• The gateway itself holds 192.168.100.1
• Your laptop might be assigned 192.168.100.10
• Your smartphone might receive 192.168.100.15
• A smart TV or gaming console could be assigned 192.168.100.18
• A network printer might be statically set to 192.168.100.20

These private addresses are how your gateway knows where to send specific data packets received from the internet. Without them, your local network could not function. The address 192.168.100.18 is just one of 254 possible host addresses in this subnet, and it can be freely assigned to any device on your network — as long as no two devices share the same address at the same time.

Related IP Addresses in the 192.168.100.x Subnet

The address 192.168.100.18 is part of a broader subnet that contains many other commonly referenced IP addresses. If you are managing a network in the 192.168.100.x range, you may also encounter or need to configure the following related addresses:

• 192.168.100.1 — The default gateway address for ARRIS, Motorola, Huawei, Zyxel, Ambit, and Ubee cable modem-router combos. This is the admin panel address for your gateway.
• 192.168.100.2 — Often the first DHCP-assigned client address on networks where the gateway holds .1.
• 192.168.100.10 — A common static IP assignment for network switches or access points on this subnet.
• 192.168.100.100 — Frequently used as the start of a DHCP pool on ISP-provisioned gateways.
• 192.168.100.254 — The last usable host address in the /24 subnet, sometimes used as an alternate gateway or management IP.

Other commonly used default gateway addresses across different subnets include 192.168.0.1, 192.168.1.254, 192.168.8.1, 10.0.0.1, and 192.168.10.1.

Frequently Asked Questions About 192.168.100.18

What is 192.168.100.18?

192.168.100.18 is a private Class C IPv4 address in the 192.168.100.0/24 subnet. It is most commonly assigned by DHCP to a client device — such as a laptop, phone, or smart TV — on a network managed by an ISP-provisioned cable modem or gateway from brands like ARRIS, Motorola, Huawei, Zyxel, Ambit Microsystems, or Ubee. It can also be manually configured as a static IP for a specific device.

Is 192.168.100.18 a router's default gateway?

No. 192.168.100.18 is not a standard default gateway address. The default gateway for the 192.168.100.x subnet is 192.168.100.1, which is used by ARRIS, Motorola, Huawei, Zyxel, Ambit, and Ubee gateways. The address 192.168.100.18 is a host address within that subnet, typically assigned to a connected client device.

Why does my device have the IP address 192.168.100.18?

Your device was assigned 192.168.100.18 by the DHCP server on your gateway. This means your network is operating in the 192.168.100.x subnet, which is characteristic of ISP-provisioned cable modem-router combos from ARRIS, Motorola, Huawei, Zyxel, Ambit, or Ubee. Your gateway's admin panel is accessible at 192.168.100.1.

Can two devices share the IP address 192.168.100.18?

No. Only one device on your local network can use 192.168.100.18 at any given time. If two devices are assigned the same IP — whether through a DHCP error or manual misconfiguration — an IP address conflict will occur, causing both devices to lose network connectivity. Your ARRIS, Motorola, Huawei, Zyxel, or Ubee gateway's DHCP server is designed to prevent this automatically, but conflicts can still occur if you manually assign static IPs without checking for existing assignments.

How do I find out which device on my network has the IP 192.168.100.18?

Log in to your gateway's admin panel at 192.168.100.1 using your admin credentials. Navigate to the Connected Devices, DHCP Client List, or LAN Status section (the exact label varies by brand — ARRIS, Motorola, Huawei, Zyxel, Ambit, and Ubee all use slightly different interfaces). You will see a list of all devices currently connected to your network along with their assigned IP addresses, MAC addresses, and sometimes device names.

How do I fix an IP address conflict involving 192.168.100.18?

If you are experiencing an IP conflict at 192.168.100.18, the quickest fix is to disconnect both affected devices from the network, then reconnect them one at a time so the DHCP server on your ARRIS, Motorola, Huawei, Zyxel, Ambit, or Ubee gateway can assign fresh, non-conflicting addresses. If one of the devices has a manually configured static IP of 192.168.100.18, go into that device's network settings and either change the static IP to an unused address or switch it back to DHCP.