CenturyLink Speed Test

Test Your CenturyLink / Quantum Fiber Internet Speed

Go beyond basic speed numbers. Measure your real CenturyLink download speed, upload speed, ping, jitter, and bufferbloat to see how your connection truly performs.

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About CenturyLink / Quantum Fiber

Technology

Fiber (Quantum Fiber / FTTH), DSL (legacy CenturyLink)

Coverage

36 states

Typical Download

100-8000 Mbps (Fiber), 10-100 Mbps (DSL)

Typical Upload

100-8000 Mbps (Fiber), 1-10 Mbps (DSL)

CenturyLink Speed Tiers & Plans

PlanDownloadUploadPrice
Simply Unlimited100 Mbps100 Mbps$50/mo
Quantum Fiber 500500 Mbps500 Mbps$60/mo
Quantum Fiber 940940 Mbps940 Mbps$70/mo
Quantum Fiber 2 Gig2000 Mbps2000 Mbps$90/mo
Quantum Fiber 8 Gig8000 Mbps8000 Mbps$175/mo

Prices and speeds are approximate and may vary by location. Promotional pricing may differ from regular rates.

Common CenturyLink Issues

DSL speeds often far below advertised maximum
Extremely slow DSL (under 10 Mbps) in rural areas
Long provisioning times for new fiber installations
Intermittent DSL disconnections in aging copper infrastructure
Latency spikes on DSL during wet weather
Confusing branding between CenturyLink DSL and Quantum Fiber

How Pong.com Helps CenturyLink Customers

Most speed tests only measure raw throughput inside your ISP's network. Pong.com goes further, testing across the real public internet to reveal what your CenturyLink connection can actually do.

Bufferbloat Detection

Discover if your CenturyLink connection suffers from high latency under load. Bufferbloat causes lag and stuttering even on fast connections.

Jitter Analysis

Measure the consistency of your CenturyLink connection. High jitter means unreliable performance for gaming, video calls, and streaming.

Connection Health Grade

Get an A-F grade for your CenturyLink connection based on speed, latency, bufferbloat, and stability. Know exactly where you stand.

Real-World Experience Scores

See how your connection performs for specific activities: 4K streaming, video conferencing, competitive gaming, and web browsing.

Speed History Tracking

Track your CenturyLink speeds over time. Spot trends, identify peak-hour slowdowns, and catch degradation before it becomes a problem.

Public Internet Testing

Unlike tests that measure inside CenturyLink's network, Pong.com tests across the real internet, giving you speeds that match your actual experience.

Compare CenturyLink to Alternatives

AT&T Internet / Fiber

300-5000 Mbps (Fiber), 10-100 Mbps (DSL) down, 300-5000 Mbps (Fiber), 1-20 Mbps (DSL) up

Fiber (AT&T Fiber), DSL (legacy IPBB)

Comcast Xfinity

200-1200 Mbps down, 5-35 Mbps up

Cable (DOCSIS 3.1), Fiber (select areas)

Frontier Fiber / DSL

500-5000 Mbps (Fiber), 6-115 Mbps (DSL) down, 500-5000 Mbps (Fiber), 1-10 Mbps (DSL) up

Fiber (XGS-PON), DSL (legacy, being phased out)

T-Mobile 5G Home Internet

50-300 Mbps down, 5-30 Mbps up

5G (n41, n71), 4G LTE (fallback)

Windstream Kinetic

500-2000 Mbps (Fiber), 10-100 Mbps (DSL) down, 500-2000 Mbps (Fiber), 1-10 Mbps (DSL) up

Fiber (Kinetic), DSL (legacy copper)

CenturyLink FAQ

Is CenturyLink throttling my internet?
If your speed test results are significantly lower than what your CenturyLink plan advertises, throttling or network congestion could be the cause. Run a test on Pong.com to check your real speeds. Pong.com tests through the public internet (not inside CenturyLink's own network) so you get an accurate picture. Try testing at different times of day to see if speeds drop during peak hours.
What speeds should I expect from CenturyLink?
CenturyLink offers download speeds of 100-8000 Mbps (Fiber), 10-100 Mbps (DSL) and upload speeds of 100-8000 Mbps (Fiber), 1-10 Mbps (DSL), depending on your plan and connection type (Fiber (Quantum Fiber / FTTH), DSL (legacy CenturyLink)). On a wired Ethernet connection, you should typically see 70-90% of your plan's advertised speed. Wi-Fi speeds will be lower due to signal attenuation and interference. Use Pong.com to verify your actual speeds.
Why is my CenturyLink internet slow even with a fast plan?
Several factors can slow down your CenturyLink connection: bufferbloat (high latency under load), Wi-Fi interference from neighboring networks, outdated modem or router firmware, network congestion during peak hours, or issues with your home wiring. Pong.com tests all of these factors in a single test, including bufferbloat detection, jitter analysis, and a connection health grade.
Does CenturyLink have bufferbloat problems?
Bufferbloat can occur on any ISP connection, but it is especially common on Fiber (Quantum Fiber / FTTH) connections. It causes your latency to spike when your connection is under load (e.g., downloading a file while on a video call). Pong.com specifically tests for bufferbloat and grades it from A (excellent) to F (severe). This tells you more about your real connection quality than download speed alone.

Ready to Test Your CenturyLink Connection?

Get the full picture: download, upload, ping, jitter, bufferbloat, and a connection health grade.

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