CenturyLink

C4000BG CenturyLink Bonded Line Wi Fi DSL Router

Name: C4000BG CenturyLink Bonded Line Wi Fi DSL Router
Brand: CenturyLink
SKU: B0977WWVYF

4.1(517 reviews)

entry$50-$99100+ bought in past month

#16,724 in Electronics#112 in Computer Routers

speed

3 Gbps

frequency

Dual-Band

compatible

Laptop

connectivity

Wi-Fi

wifi standard

802.11ax

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AI Verdict

This is a Wi-Fi 6 bonded-line DSL modem/router with 3 Gbps speed, but user reports indicate significant reliability and software issues.

Situational Fit

This router is a situational fit because it provides Wi-Fi 6 and bonded DSL support, which is essential for specific CenturyLink plans. However, its documented Wi-Fi reliability issues and buggy interface make it a frustrating experience for many users.

If you need more stable Wi-Fi and a better user experience, look for a separate bonded DSL modem and a dedicated Wi-Fi 6 router, or consider the C4000XG model if available.

Regret Score™

High Risk

Lower is better — measures purchase-regret risk from real buyer complaints, review credibility, and product maturity

50/100

vs. 201 WiFi Routers we've analyzedSafer than 11%

Hidden Defects

20/35

Issues discovered after purchase

Achilles' Heel

7/25

Critically weak dimension

Expectation Gap

12/20

Amazon rating vs actual quality

Fit Risk

11/20

Chance this product isn't for you

BuyChoice Score

2.0

Pros

Supports bonded-line DSL connections, which is necessary for certain CenturyLink services.
Features Wi-Fi 6 (802.11ax) for faster wireless connections.
Offers dual-band frequency support for 2.4 GHz and 5 GHz networks.
Rated for up to 3 Gbps speed with 2-stream connectivity.
Installation process is often described as straightforward by users.
Includes 160MHz channel support, potentially doubling speeds for compatible devices.

Cons

Users report frequent Wi-Fi connection drops and difficulty reconnecting after reboots.
The user interface is described as glitchy, crashing and returning to the login page when making changes.
Actual throughput can be lower than older models, with one user reporting 110-120 Mbps compared to 130 Mbps from a C3000A on a 140 Mbps line.
Experiences higher CPU utilization (60-70%) when functioning as an all-in-one unit compared to older models.
Wi-Fi range may not cover larger homes effectively, according to some customer feedback.
Can cause issues with device connectivity (e.g., printers via Apple Bonjour/Airprint) on the 5GHz band, sometimes requiring the 5GHz radio to be disabled.

Dimension Scores

Throughput & Range4/10

While rated for 3 Gbps with Wi-Fi 6, user reports frequently mention limited Wi-Fi range in larger homes and lower actual speeds than expected.

Reliability3/10

Numerous users experience dropped internet connections, Wi-Fi failures after reboots, and general spotty Wi-Fi performance.

Setup & Management4/10

Initial installation is often straightforward, but the user interface is widely reported as glitchy and prone to crashing during configuration changes.

Security Features5/10

It includes a 'Cyber Security' feature, but some users found disabling it necessary to resolve connectivity issues, suggesting potential implementation problems.

Best For

CenturyLink bonded-line DSL subscribers requiring a Wi-Fi 6 capable modem/router.
Users with smaller living spaces where Wi-Fi range is not a primary concern.
Individuals who prefer a single device for both modem and Wi-Fi routing functions.

Not Recommended For

Users needing consistent, uninterrupted Wi-Fi connections for work or gaming.
Anyone expecting a polished, bug-free user interface for network management.
Households with multiple devices relying on 5GHz connectivity for services like AirPrint.

Watch Out For

Wi-Fi often fails to reconnect after a reboot, requiring extensive troubleshooting.
The 5GHz Wi-Fi band can prevent devices like printers from connecting via Apple Bonjour/Airprint, necessitating its disablement.
The router's UI is prone to crashing and logging users out when settings are changed.
Reported actual speeds can be 10-20 Mbps lower than older CenturyLink modem/routers on the same bonded DSL line.
The device can run with consistently high CPU utilization (60-70%), potentially impacting performance.

Full Specifications

ASIN	B0977WWVYF
Brand	CenturyLink
Model Name	C4000BG
Item Weight	2.92 pounds
Antenna Type	Internal
Manufacturer	GREENWAVE
Special Feature	WPS
Item model number	C4000BG
Compatible Devices	Laptop
Product Dimensions	4.7 x 5.7 x 8.3 inches
Frequency Band Class	Dual-Band
Connectivity Technology	Wi-Fi
Recommended Uses For Product	Home
Wireless Communication Standard	802.11ax

What Buyers Say

The C4000BG is a mixed bag for CenturyLink bonded DSL customers. Many users find the initial setup easy, and some praise its ability to handle multiple devices without immediate speed drops. However, a recurring theme is the router's instability, with Wi-Fi often failing after reboots and requiring manual intervention. The user interface is frequently criticized for being buggy and crashing, making configuration frustrating. Furthermore, some users report that its 5GHz band causes issues with device connectivity, specifically with printers, leading to the recommendation to disable it entirely.

“Man, this thing is a headache. Every time it reboots, I gotta fight with the Wi-Fi to get it working again, and don't even get me started on trying to change a setting, the UI just craps out. Just want my internet to work, not be a part-time IT tech.”

Common Praise

Installation is quick and uncomplicated.
Handles multiple connected devices without immediate performance degradation.
The physical design feels sturdy.
One user reported improved SNR and fewer errors compared to an older C3000A modem.

Common Complaints

Wi-Fi connection drops frequently and struggles to re-establish after a reboot.
The administration interface is buggy, often crashing or logging out during setting changes.
5GHz Wi-Fi causes problems with certain devices like printers, sometimes requiring it to be turned off.
Actual internet speeds can be lower than expected, even compared to older modem models.
Wi-Fi signal range is insufficient for larger homes.
The device runs with high CPU utilization, even when not under heavy load.

Ownership Tips

You might need to disable the 5GHz Wi-Fi band if you have issues with devices like printers connecting.
Be prepared for frequent reboots and potential manual intervention to get Wi-Fi working again.
The router's admin page can be frustrating to use due to its instability.
Consider using it in bridge mode with a separate, more reliable Wi-Fi router if you experience persistent Wi-Fi issues.
Actual speeds might not reach the advertised 3 Gbps, and could even be slower than older CenturyLink modems.

Frequently Asked Questions

Is the C4000BG compatible with dial-up internet?

No, this modem/router communicates over DSL technology, which is different from dial-up, even though both use phone lines.

Can I replace the C4000BG with a different brand of router?

You can use it in transparent bridge mode with another router for Wi-Fi and routing, but for bonded DSL, you typically need a CenturyLink-compatible modem.

Why is my Wi-Fi dropping or not connecting after a reboot?

Many users report this issue; some suggest disabling the 'Cyber Security' feature in advanced settings or the 5GHz band to improve stability.

Does this router support Wi-Fi 6?

Yes, it supports the Wi-Fi 6 (802.11ax) standard, offering faster wireless speeds than previous generations.

I'm having trouble connecting my printer to the 5GHz Wi-Fi. What can I do?

Some users have resolved this by disabling the 5GHz radio in the router's admin panel, then rebooting all devices.

Buying Guide

When looking for a DSL modem/router, especially for CenturyLink's bonded lines, you're dealing with specific hardware requirements. 'Bonded line' means your internet uses two phone lines simultaneously to achieve higher speeds, so not just any DSL modem will work. Wi-Fi 6 (802.11ax) is the latest standard, offering faster speeds and better performance in congested environments, but the router's implementation matters more than just the spec sheet. You need to balance the modem's compatibility with your ISP's service and the router's actual Wi-Fi performance and stability.

wifi_standard: 802.11ax (Wi-Fi 6)

This is the newest Wi-Fi standard. Think of it like a wider, more efficient highway for your data. It means faster speeds and better handling of many devices at once, especially in busy homes, compared to older Wi-Fi 5 (802.11ac).

frequency: Dual-Band

This router broadcasts two separate Wi-Fi signals: 2.4 GHz and 5 GHz. The 2.4 GHz band is like a slow, long-range road, good for devices further away. The 5 GHz band is a fast, short-range highway, ideal for close-by devices needing high speed, like for 4K streaming or gaming.

speed: 3 Gbps

This is the theoretical maximum combined wireless speed the router can achieve across both bands. It's like the top speed limit on the data highway. Your actual internet speed will depend on your CenturyLink plan and how many devices are using the Wi-Fi.

Alternatives

If this model doesn't fit, search for a separate bonded VDSL2 modem and a Wi-Fi 6 router with a strong reputation for stable firmware and wide Wi-Fi coverage.

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