DOUGLAS prefixes in area code 520
NANPA records 10 assigned NXX blocks to rate center DOUGLAS in area code 520, 1.4% of the 699 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 5 holders hold those blocks, the largest being QWEST CORPORATION (3), ONVOY, LLC - AZ (3), IP HORIZON LLC (2). The earliest assignment on record here is 2005-08-24 and the most recent 2026-10-30. 9 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 307, 402, 580, 701 – overlay codes cover the same geography, so a rate center is served by all of them.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 520-364 | Lumen QWEST CORPORATION | – | no | yes |
| 520-368 | Lumen QWEST CORPORATION | 2007-11-07 | yes | yes |
| 520-379 | Onvoy ONVOY, LLC - AZ | – | yes | yes |
| 520-536 | Onvoy ONVOY, LLC - AZ | 2020-12-22 | yes | yes |
| 520-564 | IP HORIZON LLC | 2021-09-03 | yes | yes |
| 520-645 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 2013-09-30 | yes | yes |
| 520-702 | Onvoy ONVOY, LLC - AZ | 2022-01-14 | yes | yes |
| 520-727 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2005-08-24 | yes | yes |
| 520-768 | IP HORIZON LLC | 2026-10-30 | yes | no |
| 520-805 | Lumen QWEST CORPORATION | – | yes | yes |
The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.
Who holds the blocks
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| QWEST CORPORATION | Lumen | 3 | 30% |
| ONVOY, LLC - AZ | Onvoy | 3 | 30% |
| IP HORIZON LLC | – | 2 | 20% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | Verizon | 1 | 10% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 1 | 10% |
Same rate center in other codes
Overlay codes cover the same geography, so one rate center is served by all of them.
Frequently asked
Which prefixes belong to DOUGLAS in area code 520?
10 blocks: 364, 368, 379, 536, 564, 645, 702, 727, 768, 805. The table above gives the holder of each.
Which carriers have numbers in DOUGLAS?
QWEST CORPORATION (3 blocks), ONVOY, LLC - AZ (3 blocks), IP HORIZON LLC (2 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ (1 block), NEW CINGULAR WIRELESS PCS, LLC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is DOUGLAS a city?
It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.