If you have just set up a new office, consider a cost-effective way to get a high-performing network for your space. The Xfinity Cisco DPC3939 (Comcast XB3) may be the perfect fit for you. It is a wireless business gateway that has a variety of features all merged into a single product. Once you get past the Xfinity Cisco DPC3939 login, you will see the plethora of features that make it the sound choice.

The Xfinity Cisco DPC3939 gateway gives you a speedy internet connection by merging 24-bonded downstream channels with dedicated four bonded upstream channels. How exciting is it to receive download speeds up to 900Mbps while the upstream speed is 120Mbps? 

Keep in mind that you need to configure the Xfinity Cisco DPC3939 login, then you are all set to enjoy your set of preferred features. This article will guide you through the entire process, so let’s begin.

Logging into the Xfinity Cisco DPC3939 Router

If you just got the Xfinity Cisco DPC3939 (XB3), you might need some help logging into the router. The first thing to know about your router is the IP address that will let you access the default gateway.

You will be able to see the IP address over the box. If not, you can check your router’s IP by following the steps below:

Method 1:

1. Go to your Command Prompt (CMD) and enter the Ping command followed by any web address.
2. Download any free software which can get your specific IP for different devices.

Once you get the IP address, you can then get across the default login gateway.

Method 2:

You need to begin the process by entering the IP address into your local browser; make sure you are entering the Xfinity Cisco DPC3939 router’s login address. You shall see a web interface that lets you configure the router as per your ease.

1. You will see a dialogue box with a prompt asking for the DPC3939 router’s default login username and password.
   • Login Username: admin
   • Login Password: password
2. If you are entering the default gateway for the first time, then enter the default credentials. If you have already changed the credentials, then use the new one that you had recently set.
3. You will then see a screen that has several different bars to set configurations for your Xfinity router. Fiddle with the functions, and you are good to go.

FAQ and Fixes to Xfinity Cisco DPC3939 Common Issues 

1. Xfinity Cisco DPC3939 password isn’t working.

Every router has the same default credentials, but you can try a different password if you don’t find any password matching.

The Most Common Passwords that Allows You to Log in to the Router’s Default Gateway:

Router Name	Default IP Address	Default UserName	Default Password
3Com	192.168.1.1	n/a	admin
3Com		adminttd	adminttd
3Com		admin	n/a
3Com		n/a	PASSWORD
3Com		root	!root
ACC		netman	netman
ACCTON	192.168.2.1	n/a	0
Aceex	192.168.8.1	admin	n/a
Aceex	10.0.0.2	admin	epicrouter
Actiontec		n/a	n/a
ADC Kentrox		n/a	secret
Adtran		n/a	n/a
AirLink+	192.168.1.1	admin	admin
Aiway		0	n/a
Allied Telesyn		root	n/a
Allied Telesyn		Manager	Friend
Allnet		admin	admin
Ambit	192.168.100.1	user	user
Ambit	192.168.100.1	admin	password
Ambit		root	n/a
Amitech		admin	admin
Apple	10.0.1.1	n/a	n/a
Arescom		n/a	atc123
Arescom	192.168.1.1	dsladmin	n/a
Ascend		admin	ascend
Ascend		n/a	ascend
Ascom
Asmack		admin	epicrouter
ASUS	192.168.1.1	admin	admin
Avaya		root	root
Bausch Datacom	10.0.0.2	admin	epicrouter
Bay Networks		User	n/a
Bay Networks		Manager	n/a
Bay Networks		Manager	Manager
Belkin	192.168.2.1	n/a	n/a
Belkin		admin	n/a
Benq		Admin	admin
Bintec		admin	bintec
Boson		n/a	n/a
Broadlogic		admin	admin
Broadlogic		installer	installer
Broadlogic		webadmin	webadmin
Buffalo	192.168.11.1	root	n/a
Cable & Wireless		Admin	1234
Cabletron		netman	n/a
Cabletron		n/a	n/a
Canyon		Administrator	admin
Canyon	192.168.62.1	admin	1234
Cayman		Any	n/a
Cisco		cisco	cisco
Cisco		n/a	san-fran
Conexant		n/a	admin
Conexant		n/a	epicrouter
Dell	192.168.1.1	admin	admin
Digicorp		n/a	BRIDGE
Digicorp		n/a	password
D-Link	192.168.0.1192.168.0.30192.168.0.50	n/a	n/a
D-Link	192.168.0.1 or192.168.1.1	Admin	Admin
D-Link		n/a	admin
D-Link		admin	n/a
D-Link		user	n/a
D-Link		n/a	1234
D-Link		n/a	year2000
E-Con		admin	epicrouter
Edimax		admin	1234
Efficient		login	admin
Efficient		admin	admin
Efficient Networks		n/a	hs7mwxkk
Elsa		n/a	cisco
Ericsson (Formerly ACC)		netman	netman
E-Tech		n/a	admin
E-Tech	10.0.0.2	admin	epicrouter
Flowpoint	192.168.254.254	n/a	admin
Flowpoint		n/a	password
Fujitsu Siemens		n/a	connect
Gateway		admin	admin
IBM		n/a	ascend
Infosmart		admin	0000
Intel		admin	hello
Intel		NICONEX	NICONEX
Intel		n/a	babbit
Ipstar		admin	operator
JAHT	10.0.0.2	Admin	epicrouter
Linksys		Administrator	admin
Linksys	192.168.0.1192.168.1.1192.168.1.225 192.168.1.226 192.168.1.245 192.168.1.246	n/a	admin
Linksys	192.168.1.1192.168.1.251	admin	admin
Livingston		!root	n/a
MacSense		admin	admin
Medion		n/a	medion
Microsoft Broadband Networking Routers also known as “Base Station” routers	192.168.2.1	admin	admin
Microsoft Broadband Networking Routers also known as “Base Station” routers		n/a	admin
Mikrotik		admin	n/a
Motorola		cablecom	router
Motorola		admin	motorola
Motorola		admin	password
Netgear	192.168.0.1	admin	password
Netgear	192.168.0.227	admin	password
Netgear		n/a	1234
Netgear		Admin	1234
Olitec		admin	admin
Olitec		admin	adslolitec
Pentagram		admin	password
Pentagram		n/a	pento
Pirelli		admin	mu
Pirelli		admin	microbusiness
Pirelli		user	password
Siemens		superuser	admin
Sitecom	192.168.0.254	admin	admin
Sitecom	192.168.0.1	n/a	sitecom
SmartSwitch		admin	n/a
SMC	192.168.2.1	n/a	n/a
SMC		admin	admin
SMC	192.168.2.25	admin	smcadmin
SMC		n/a	smcadmin
SMC		admin	barricade
SMC		cusadmin	highspeed
SMC		n/a	0000
SMC	192.168.2.1	n/a	n/a
Speed Touch (Alcatel)	10.0.0.138	Administrator	n/a
Speedstream		admin	admin
T-Comfort		Administrator	n/a
Teledat		admin	1234
Telekom Malaysia		ZXDSL	ZXDSL
Telekom Malaysia		ADSL	expert03
Teletronics	192.168.1.1	admin	1234
Telnet	192.168.1.1	n/a	n/a
UNEX		n/a	password
US Robotic	192.168.123.254	admin	admin
US Robotic		admin	n/a
US Robotic		root	12345
US Robotic		n/a	12345
Westell		admin	sysadmin
X-Micro		super	super
X-Micro		1502	1502
Xyplex		n/a	access
Xyplex		n/a	system
Yakumo		admin	admin
Zyxel		admin	admin
Zyxel	192.168.1.1	admin	1234
Zyxel		n/a	1234
Zyxel		n/a	n/a

2. Forgot Password to the Xfinity Cisco DPC3939 Router

If you had your credentials written somewhere, it is better to check the certificates since it may be the only way to get into the default login page. If the ISP or internet service provider did it for you, go ahead and contact them to determine the proper credentials.

3. Reset the Xfinity Cisco DPC3939 Router to Default Settings

If you cannot remember the default username and password, you will have to reset your password. Resetting happens only when you reboot the device so that it can get back to factory settings. Here is how:

1. Unplug the power connector from behind the router and plug it back in.
2. Wait about 30 seconds for the router to reboot.
3. Your internet connection will drop when your router reboots. If someone uses a computer on your network to access the internet, you may want to warn them prior.

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Logging into the Xfinity Cisco DPC3939b Router

Similar to accessing the Xfinity Cisco DPC3939 router, follow the same process for the DPC3939b login procedure. Just make sure the login credentials are familiar to you. If you have never changed it, then it is easy to find the default credentials. In case this is not your first time, remember the new credentials necessary to proceed.

1. Open your local browser and type the IP address http://10.1.10.1 in the URL
2. This will open the network administrator for Cisco dpc3941B/3939B
3. Now enter the dpc3939b default login credentials as mentioned below:
   • Login Username: cusadmin
   • Login Password: highspeed or CantTouchThis
4. Now you can navigate through the options. Gateway > Connection > Local IP network
5. You can see various functions here, such as assigning the DNS manually.
   • Primary DNS server: 8.8.8.8
   • Secondary DNS server: 8.8.4.4
6. Always save the settings whenever you have changed something.

FAQ and Fixes to Xfinity Cisco DPC3939b Common Issues 

1. Cusadmin Not a Valid Username

Well, this will happen only when either you are not entering the correct username, or someone has already changed it. If you are trying to access the DPC3939b login page via the web or outside your local area network, stay on the side of caution and try connecting from your home network before getting access to the login page.

2. Unable to Access the Utility Manager

To access the utility manager, make sure you are connected to the DPC using your system secured with an ethernet cable with Lan ports from 1 to 4 on the DPC router’s back.

Once you have accessed both Xfinity Cisco routers and secured your network settings, leave us a comment which tip helped you improve your home networking experience.