How to Reset Cisco DPC3825

Resetting your Cisco DPC3825 is one of the easiest ways to correct almost all common technical issues that you may experience over the life of your modem. It’s a super handy tool to have in your troubleshooting repertoire and can save you hours on the phone with your provider. Here’s how it’s done:

  1. Plug your modem in to the power supply and wait 2 minutes for it to boot up fully. You’ll know it’s booted fully when the wireless lights come on.
  2. Locate the reset button on the back of the modem. It’ll be on the same side where all the ports are located. Generally reset buttons on this kind of device will just be a tiny hole that may or may not be labeled.
  3. You’ll need a flattened paperclip or pen cartridge to do this next part. Press down and hold the reset button for 30 seconds with your modem still plugged in. You should feel a small dull click when you press in the reset button with your paperclip.
  4. Now wait a few minutes for your modem to reset and reboot itself. You’ll know it’s finished and ready to use when the WiFi lights come back on.

Tip: Still not resetting? Try just holding down for 15 or 20 seconds instead of the full 30. Some firmware versions differ on the number of seconds needed for a reset. You can also check out our more in-depth guide on how to reset your modem for more information.

Cisco DPC3825 Cable Modem

How to Install the Cisco DPC3825

Installing the DPC3825 and activating it with your internet service provider generally takes anywhere from 30 minutes to 1 hour, depending on your experience level with technology and call volume with your provider (how long you’re waiting on hold to speak with an agent). Follow these instructions for generalized activations with most providers, but if you’re looking for more specific information on activating this model, you’ll need to consult with instructions that are custom tailored for your internet provider.

  1. To install your cable modem, plug it in the same way as the one you’re replacing was plugged in. If you’re installing new service, make sure the device is plugged into the power supply cable and is turned on. Also ensure the Coaxial cable is screwed into the back of your modem. It’s advised to wait to connect anything via Ethernet until further along in the installation process.
  2. After your modem has been plugged in for a few minutes and has fully booted up, we recommend doing a quick factory reset if your modem was purchased used or refurbished, just to ensure a clean slate when going through activation.
  3. Next step will be to call your internet service provider. You can usually find their contact information on your internet service bill, but you can also google it to find their contact information. They’ll take it from here and walk you through the remainder of your modem activation.
  4. We always recommend doing a test of your internet after they’ve activated your equipment, but before you hang up with their customer service. Generally, internet service will be ready to go right away after they say it’s been activated and it’s a good idea to test it out before hanging up, just to save time.

Nice job activating your new modem! If you have any issues with your device after activation, we recommend contacting the company you purchased it from. If you bought your modem on, you can head over to our customer care center for assistance from our US-Based tech support agents.

How to Login to the Cisco DPC3825

Logging into your modem router’s IP address allows you to access important settings like WiFi, security and enabling/disabling certain functions like parental controls or guest networks. It also is helpful in preventing you from having to call your provider to perform these actions remotely. In essence, it’s nice to know, but definitely not required. Our stance is, since it’s so easy to do once you know how, we feel everyone should know how to do it. Here’s how to do it:

Most wireless routers have their IP address printed on the same sticker with all the serial numbers, and unique identifiers for your device. This IP address will appear in a format similar to some of the examples below:


If, for whatever reason, your device does not have this IP address printed on it, you’ll need to find it manually using the instructions below.

How to Find Your IP Address

This method works on Windows computers and does not require any software to be downloaded. You’ll be using command prompt to find the internal IP address so you can log into your WiFi router or modem router’s settings panel.

  1. Click the start menu in the bottom left of your screen.
  2. In the search bar in your start menu, type in “cmd.exe” and then click on that program when it appears in the search.
  3. When the program opens, you’ll see a black window on your screen with white text.
  4. Type into the program “ipconfig“, then hit Enter. Your window should look like the one shown below. The IP address circled below shows where your internal IP address will be on your command prompt window. Now you can move on to accessing your modem or modem router’s settings admin panel.

Accessing Your Device’s Settings Panel

Now that you’ve got your device’s IP address you can now use that to access your device’s settings panel! Here’s how to do it:

  1. Connect an Ethernet cable going into the back of your DPC3825 modem, and plug the other end into your computer. If your computer does not have any Ethernet ports and you are able to connect to it wirelessly, that’s ok too. If you don’t have the ability to connect via Ethernet OR wirelessly, we recommend doing a factory reset on your device before starting and then connecting through WiFi with your device’s default WiFi login credentials.
  2. Once you’re hooked up to the device via wired or wireless connection, open a web browser on your computer. We recommend using Safari, Chrome or Firefox as Internet Explorer and Microsoft Edge have been unreliable for this specific task in the past.
  3. In the URL bar (where you normally type the website you’re trying to go to) type in your device’s internal IP address, then hit Enter.
  4. You’ll be faced with a login page asking for a username and password. Usually the username and password for any modem is located on the modem’s stickers. Most devices have some variation of “admin” for the username and “password” for the password. If you’re having trouble finding yours, you can always give that combo a try as it works for a large variety of modems and routers.
  5. Once you’ve logged in, you can then access all of your device’s settings from Parental controls, to guest networks, to wireless settings and even perform a factory reset without even having to touch your router!

Did we answer all your questions about the Cisco DPC3825 cable modem? Let us know in the comments, or leave your own questions for our technicians to answer!

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