P-873HNUP-51B
802.11n Wireless VDSL2 4-port Gateway

The ZyXEL P-873HNUP-51B router has 300mbps WiFi, 4 100mbps ETH-ports and 0 USB-ports.
It is also known as the ZyXEL 802.11n Wireless VDSL2 4-port Gateway.

Quick links:
Default password/Login
Login instructions
User Manuals

P-873HNUP-51B router specifications (specs)

Hard reset instructions for ZyXEL P-873HNUP-51B

If your P-873HNUP-51B router is not working as it should, dropping connections or not being responsive, you should first do a reset of the router to see if the problems persist. Other scenarios where you might want to reset your router is if you've forgotten the password or misconfigured it and can't get access anymore.
Your can reset your ZyXEL P-873HNUP-51B in the following way(s):

Through the web interface

1. Open web browser and go to the address of your router (check defaults below)
2. Log in with your username/password (default are below)
3. Under Maintenance, locate Backup/Restore and click it
4. Locate the section Factory defaults and click the reset button, if prompted click Ok
5. Wait for the router to reboot

With the reset button

1. Have the router plugged in and turned on
2. Locate the reset button which is marked reset and usually in a hole
3. With a paperclip or sharp pen, press and hold the reset button for 10 seconds until the SYS light starts to blink
   1. If the SYS light doesn't start to blink after 10 seconds:
      1. Keep holding the reset button pressed
      2. Turn off the modem / unplug it
      3. While still holding the reset button, start / plug in the router
      4. After about 20 seconds, the Power or SYS light will start blinking rapidly
      5. Release the reset button
4. When the light stops blinking and light up normally the router is reset.

The 30-30-30 reset

1. When router is powered on, press the reset button and hold for 30 seconds. (Use a paper clip or something sharp)
2. While holding the reset button pressed, unplug the power of the router and hold the reset button for 30 seconds
3. While still holding the reset button down, turn on the power to the unit again and hold for another 30 seconds.

This process usually works for resetting any router to it's factory setting.

Note: It is worth reading more about how to reset routers with the 30 30 30 reset and what the risks and considerations are when resetting your router this way, instead of just rebooting it.

Default factory settings for ZyXEL P-873HNUP-51B

How to login to the P-873HNUP-51B

To login to the 802.11n Wireless VDSL2 4-port Gateway and change the settings, you can follow these steps:

1. Make sure you are connected to the router's network, either by Wi-Fi or ethernet cable.
2. Open your browser and visit http://192.168.1.1
3. You should be prompted with a login dialogue.
4. Enter the username: admin and the password 1234
   Note: If you have already changed the password use that instead.
5. You will now be logged in. If you haven't yet changed the defaul password, we recommend that you change it first thing you do after logging in.

If these instructions don't work for your router, you can always try a factory reset to get the default, or try some other common ZyXEL credentials, as they can usually be shared across models/variants.

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