Internet provider · CO · Fiber
Underline
★ Quick answer
Colorado open-access fiber. 10 Gig at $199 changes the math vs Xfinity in CO Front Range cities.
🟢
RECOMMENDED
When available, take it.
- Parent company
- Underline Infrastructure (private)
- Founded
- 2021
- Headquarters
- Boulder, CO
- Service types
- Fiber
- States served
- 1 state: CO
- ZIPs covered
- ~22
- Residential subs
- ~12,000 (2026-Q1)
- Gateway fee
- Included
- Install fee
- Free
- Contract
- None
Plans & pricing
| Tier | Down | Up | Price | Data cap |
|---|---|---|---|---|
| 1 Gig | 1 Gbps | 1 Gbps | $79/mo | Unlimited |
| 10 Gig | 10 Gbps | 10 Gbps | $199/mo | Unlimited |
Notes: Colorado open-access fiber. Sells wholesale + retail. 10 Gig symmetrical at $199 is aggressive vs Xfinity in CO Front Range.
Cities + markets served
- Colorado Springs CO
- Fountain CO
- Lone Tree CO
Does Underline serve your address?
Use our ZIP-coverage tool to confirm availability — we cross-reference live FCC Form 477 data with the carrier's own footprint map.
Check coverage at my ZIP →Sources & verification
Last verified 2026-06-09. Records over 180 days old are auto-flagged for re-verification.