Underline Internet Availability
Underline internet availability by address. Enter a zip code, city, or address below to see all providers.
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Underline a large multi-regional internet service provider, operating in 1 state or territory covering 131,401 people, and offering speeds over 1,000 Mbps to 100.00% of those people. Underline offers fiber connections, explore our comprehensive and frequently updated availability maps below.Underline Availability Maps
Underline has internet service available to less than 1% of people in the US. Among those covered, the breakdown by service type is as follows:
- Fiber internet for 100.00%
This map illustrates Underline’s internet availability across the United States. Use the buttons at the top of the map to toggle between the different types of connections including fiber.
For more detailed comparisons and interactive maps, visit our Internet Service Providers Near You page. Alternatively, you can search by address on our Internet Service Providers by Address page, or use the search feature at the top of this page.
This page reflects the most recent FCC update from January 06, 2026, based on the Broadband Data Collection as of June 30, 2025.
Underline Internet Plans & Pricing
| Plan | Monthly Price | Typical Download Speed | Typical Upload Speed | Connection Type |
|---|---|---|---|---|
| Starting At | $49.00 | 1000 Mbps | 1000 Mbps | Fiber |
Note: These provider-reported typical speeds reflect plan-specific expectations, while speed metrics elsewhere on our site measure maximum available performance across areas.
Underline Internet by State
This map highlights Underline coverage and speeds by state, Underline has the biggest presence in Colorado. Hover over each state to see Underline availability by connection type, and click on a state to see all providers in that state.
Underline Internet Customer Reviews
Underline has 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.
Underline’s Biggest Competitors
Underline frequently competes for customers with providers like XFINITY, Centurylink, and T-Mobile Home Internet. Below, we offer a side-by-side comparison of these ISPs based on key metrics such as service availability, average speeds, and customer ratings.
| Underline vs XFINITY | |
|---|---|
| 99.93% Availability Overlap | |
 |  |
| National Availability | |
| less than 1% | 35.89% |
| High Speed Availability | |
| 100.00% Fiber | 99.99% Cable |
| Average Speed | |
| 1,000 Mbps | 1,967 Mbps |
| Customer Rating | |
 (0) |  (2165) |
| Underline vs Centurylink | |
|---|---|
| 93.28% Availability Overlap | |
|  |
| National Availability | |
| less than 1% | 11.60% |
| High Speed Availability | |
| 100.00% Fiber | 50.64% Fiber |
| Average Speed | |
| 1,000 Mbps | 498 Mbps |
| Customer Rating | |
| (0) | (163) |
| Underline vs T-Mobile Home Internet | |
|---|---|
| 82.16% Availability Overlap | |
|  |
| National Availability | |
| less than 1% | 85.72% |
| High Speed Availability | |
| 100.00% Fiber | 100.00% Fixed Wireless |
| Average Speed | |
| 1,000 Mbps | 59 Mbps |
| Customer Rating | |
| (0) |  (284) |
Underline competes with 14 other ISPs across the U.S., defined as any provider that competes in at least some part of Underline's service area. On average, customers within Underline's service area have about 7.1 alternative ISP options to choose from.
Biggest Cities with Underline Internet Service
Underline is available in 4 cities throughout the country. Here is a list of the largest 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 Frequently Asked Questions
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How fast is Underline Internet?
- The fastest available speed from Underline is 1,000 Mbps download 1,000 Mbps upload. Speed tiers start at 1,000 Mbps download and 1,000 Mbps upload for cheaper service packages.
- The average speed most people can get from Underline is 1,000 Mbps download and 1,000 Mbps upload.
- Have Underline and want to see what speed you get? User our Underline Speed Test tool to find out.
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Is Underline available in my area?
- Underline is available to less than 1% of people in the United States. It is available in 1 state or territory, 4 cities, and 12 zip codes. You can use our internet providers by address or internet providers by zip code tools to see if Underline is available in your area.
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Does Underline have fiber internet?
- 100.00% of Underline customers can subscribe to fiber internet. These customers receive an average download speed of 1,000 Mbps and average upload speed of 1,000 Mbps.
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Does Underline have cable internet?
- Underline does not offer any Cable internet service.
-
Does Underline have DSL internet?
- Underline does not offer any DSL internet service.
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Does Underline have Fixed Wireless internet?
- Underline does not offer any Fixed internet service.