Underline Speed Test
Enter a zip code, city, or address below to see what speeds you can expect in your location for Underline and other ISPs.
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What your speed can do at home
Based on the same per-activity budgets as our how much speed do you need quiz.
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Are you getting the speed you pay for?
My plan advertises Mbps
Measured Advertised (up to)
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.
Jump to: What to Expect | Speed Reviews | Underline Availability
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.
Underline Measured Speeds
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 Reviews
Underline has an overall rating of out of 5, with a total of 0 reviews and ratings across the United States. If you'd like to tell others about your experience, you can rate or review Underline here.
Top Cities for Underline
Underline is available in 4 cities throughout the country. Here is a list of top cities with Underline internet service:
Colorado Springs, CO
- Availability: 17.40%
- Avg. Download Speed: 1,000 Mbps
Security-Widefield, CO
- Availability: 30.52%
- Avg. Download Speed: 1,000 Mbps
Fountain, CO
- Availability: 16.99%
- Avg. Download Speed: 1,000 Mbps
Manitou Springs, CO
- 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.