Underline Speed Test
Test your Underline connection, see whether it is normal for your plan, and find faster internet near you.
Ready to Test
Is your speed normal?
Which plan do you have?
Faster internet near you
Check your exact address · See every provider here
Speeds are the fastest plans each provider reports to the FCC for this area, and coverage is the share of homes it reaches. Not every home can get every plan.
Your connection quality
What your speed can do at home
Based on the same per-activity budgets as our how much speed do you need quiz.
Are you getting the speed you pay for?
Now compare your speed to the providers available at your address.
See providers at your address →How we measure: a real-world test to a neutral point on the open internet, not a server inside your provider network, so it reflects everyday speed and can read slightly below best-case on-network tests.
We record anonymized results (speed, latency, your provider and coarse location) to publish honest, real-world speed data by provider. No personal information is stored.
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What to Expect from Underline
Underline’s fastest available plans reach 1,000 Mbps down / 1,000 Mbps up, and across its footprint typical available speeds are about 1,000 Mbps down / 1,000 Mbps up. These are advertised “up to” figures from FCC availability data, so no connection reaches them exactly. Run the test above to see what your own Underline line actually delivers.
Look up another place: enter a ZIP code, city, address or provider to see what speeds you can get there from Underline and other providers.
Compare providers near you
Enter your ZIP or city to see how providers in your area compare.
Providers available in your area come from our coverage data. "Available up to" is the fastest advertised plan; measured speeds appear once a provider has enough independent tests, otherwise we say "collecting" rather than guess.
Underline Speed Ratings
out of 5
Speed rating
From 0 Underline customer reviews across the United States.
No speed ratings for Underline yet. Rate it after your test, or any time.
Top Cities for Underline
Underline is available in 4 cities throughout the country. Here is a list of top cities with Underline internet service:
- Availability: 17.40%
- Avg. Download Speed: 1,000 Mbps
- Availability: 30.52%
- Avg. Download Speed: 1,000 Mbps
- Availability: 16.52%
- Avg. Download Speed: 1,000 Mbps
- Availability: 9.62%
- Avg. Download Speed: 1,000 Mbps
Underline Speed Test FAQ
Why is my Underline speed lower than advertised?
Advertised speeds are “up to” peaks measured on an ideal connection. Real-world speed to a neutral point on the open internet runs a few percent lower, and Wi-Fi, older equipment, or peak-hour congestion lower it further. For the truest read of your Underline line, test over a wired connection.
How does ISPReports measure Underline speeds?
Tests run against the nearest of Cloudflare’s edge locations, so the result reflects your access network rather than a server inside Underline’s own network. We verify each result by network operator, aggregate it as a median (not an average, which a few fast tests would skew), and only publish a provider’s measured speeds once enough independent tests exist. We do not accept provider-submitted numbers.
Is Underline good for gaming and video calls?
Run the test above. The connection-quality grade reads latency under load and packet loss, which determine whether calls and games stay smooth, beyond the raw download number.
Can I get faster internet than Underline where I live?
After the test, the result lists the providers in your ZIP code that advertise faster plans than the speed you measured. For the providers at your exact address, check your address on our internet providers by address page.