Phone numbers in Allnspklyn, Colorado
Allnspklyn has 12 phone prefixes in area codes 303, 720.
Biggest holders: Onvoy, CenturyLink / Lumen, AT&T (local phone). This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 25%
- Internet / business phone carrier 75%
Every prefix in Allnspklyn
Search the first six digits of a number in this list. If it's here, the number started in Allnspklyn with the carrier shown. If it isn't, check the Colorado page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 303-747 | CenturyLink / Lumen | Local phone company | – |
| 303-823 | CenturyLink / Lumen | Local phone company | – |
| 720-307 | AT&T (local phone) | Local phone company | 2012 |
| 720-310 | Teleport Communications America | Internet / business phone carrier | – |
| 720-414 | Level 3 (Lumen) | Internet / business phone carrier | 2011 |
| 720-571 | Onvoy | Internet / business phone carrier | 2016 |
| 720-664 | Onvoy | Internet / business phone carrier | 2019 |
| 720-790 | Onvoy | Internet / business phone carrier | 2020 |
| 720-794 | Onvoy | Internet / business phone carrier | – |
| 720-816 | Onvoy | Internet / business phone carrier | 2023 |
| 720-893 | Bandwidth | Internet / business phone carrier | 2014 |
| 720-915 | Vonage America | Internet / business phone carrier | 2022 |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.