SIERRAVIST prefixes in area code 520
NANPA records 70 assigned NXX blocks to rate center SIERRAVIST in area code 520, 10.0% 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. 16 holders hold those blocks, the largest being MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ (20), QWEST CORPORATION (12), TELEPORT COMMUNICATIONS AMERICA, LLC - AZ (10). The earliest assignment on record here is 2001-05-15 and the most recent 2024-10-22. 55 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 520-220 | T-Mobile T-MOBILE USA, INC. | 2002-05-31 | yes | yes |
| 520-224 | Allstream ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | – | yes | yes |
| 520-226 | Lumen LEVEL 3 COMMUNICATIONS, LLC - AZ | 2002-04-09 | yes | yes |
| 520-227 | T-Mobile T-MOBILE USA, INC. | 2002-05-16 | yes | yes |
| 520-234 | T-Mobile T-MOBILE USA, INC. | 2002-11-06 | yes | yes |
| 520-236 | T-Mobile METROPCS, INC. | 2002-09-17 | yes | yes |
| 520-249 | T-Mobile T-MOBILE USA, INC. | – | yes | yes |
| 520-255 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 2004-04-28 | yes | yes |
| 520-263 | Comcast COMCAST IP PHONE, LLC | – | yes | yes |
| 520-266 | T-Mobile T-MOBILE USA, INC. | 2002-08-09 | yes | yes |
| 520-267 | NORTH COUNTY COMMUNICATIONS CORPORATION | – | no | yes |
| 520-335 | Comcast COMCAST IP PHONE, LLC | – | yes | yes |
| 520-376 | T-Mobile METROPCS, INC. | 2019-02-19 | yes | yes |
| 520-378 | Lumen QWEST CORPORATION | – | no | yes |
| 520-417 | Lumen QWEST CORPORATION | – | no | yes |
| 520-439 | Lumen QWEST CORPORATION | – | no | yes |
| 520-452 | Lumen QWEST CORPORATION | – | no | yes |
| 520-454 | Lumen QWEST CORPORATION | 2009-02-13 | yes | yes |
| 520-456 | Lumen QWEST CORPORATION | – | yes | yes |
| 520-458 | Lumen QWEST CORPORATION | – | no | yes |
| 520-459 | Lumen QWEST CORPORATION | – | no | yes |
| 520-473 | T-Mobile T-MOBILE USA, INC. | 2020-11-23 | yes | yes |
| 520-504 | T-Mobile T-MOBILE USA, INC. | 2021-04-02 | yes | yes |
| 520-508 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | – | no | yes |
| 520-515 | Lumen QWEST CORPORATION | – | no | yes |
| 520-523 | Onvoy ONVOY, LLC - AZ | 2020-05-07 | yes | yes |
| 520-533 | Lumen QWEST CORPORATION | – | no | yes |
| 520-538 | Lumen QWEST CORPORATION | – | no | yes |
| 520-556 | T-Mobile T-MOBILE USA, INC. | 2021-08-24 | yes | yes |
| 520-559 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | – | no | yes |
| 520-654 | COMMIO, LLC | 2022-08-25 | yes | yes |
| 520-669 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2023-03-09 | yes | yes |
| 520-671 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2023-03-09 | yes | yes |
| 520-672 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2023-03-09 | yes | yes |
| 520-673 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2023-03-09 | yes | yes |
| 520-674 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2023-03-09 | yes | yes |
| 520-678 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | – | no | yes |
| 520-684 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2023-08-31 | yes | yes |
| 520-685 | Comcast COMCAST IP PHONE, LLC | – | yes | yes |
| 520-687 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2023-08-31 | yes | yes |
| 520-691 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2023-08-31 | yes | yes |
| 520-692 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2023-08-31 | yes | yes |
| 520-693 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2023-08-31 | yes | yes |
| 520-699 | FRACTEL, LLC | 2021-10-15 | yes | yes |
| 520-706 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2024-01-08 | yes | yes |
| 520-707 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2024-01-08 | yes | yes |
| 520-708 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2024-01-08 | yes | yes |
| 520-713 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2024-01-08 | yes | yes |
| 520-714 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2024-01-08 | yes | yes |
| 520-715 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2024-01-08 | yes | yes |
| 520-716 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2024-01-08 | yes | yes |
| 520-717 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2024-01-08 | yes | yes |
| 520-718 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2024-01-08 | yes | yes |
| 520-725 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 2024-01-08 | yes | yes |
| 520-732 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 2001-05-15 | yes | yes |
| 520-735 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2024-03-28 | yes | yes |
| 520-737 | ALLO COMMUNICATIONS LLC | 2024-06-17 | yes | yes |
| 520-803 | Lumen QWEST CORPORATION | – | no | yes |
| 520-843 | Onvoy ONVOY, LLC - AZ | – | no | yes |
| 520-851 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 2024-10-22 | yes | yes |
| 520-852 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 2024-10-22 | yes | yes |
| 520-853 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 2024-10-22 | yes | yes |
| 520-854 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 2024-10-22 | yes | yes |
| 520-855 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 2024-10-22 | yes | yes |
| 520-895 | Lumen LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | – | yes | yes |
| 520-941 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 2023-07-27 | yes | yes |
| 520-942 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 2023-07-27 | yes | yes |
| 520-943 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 2023-07-27 | yes | yes |
| 520-944 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 2023-07-27 | yes | yes |
| 520-945 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 2023-07-27 | 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 |
|---|---|---|---|
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | Verizon | 20 | 28.6% |
| QWEST CORPORATION | Lumen | 12 | 17.1% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | AT&T | 10 | 14.3% |
| T-MOBILE USA, INC. | T-Mobile | 8 | 11.4% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | Verizon | 5 | 7.1% |
| COMCAST IP PHONE, LLC | Comcast | 3 | 4.3% |
| METROPCS, INC. | T-Mobile | 2 | 2.9% |
| ONVOY, LLC - AZ | Onvoy | 2 | 2.9% |
| ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | Allstream | 1 | 1.4% |
| LEVEL 3 COMMUNICATIONS, LLC - AZ | Lumen | 1 | 1.4% |
| NORTH COUNTY COMMUNICATIONS CORPORATION | – | 1 | 1.4% |
| COMMIO, LLC | – | 1 | 1.4% |
| FRACTEL, LLC | – | 1 | 1.4% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 1 | 1.4% |
| ALLO COMMUNICATIONS LLC | – | 1 | 1.4% |
| LEVEL 3 TELECOM OF ARIZONA, LLC - AZ | Lumen | 1 | 1.4% |
Frequently asked
Which prefixes belong to SIERRAVIST in area code 520?
70 blocks: 220, 224, 226, 227, 234, 236, 249, 255, 263, 266, 267, 335 and 58 more, all listed in the table above.
Which carriers have numbers in SIERRAVIST?
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ (20 blocks), QWEST CORPORATION (12 blocks), TELEPORT COMMUNICATIONS AMERICA, LLC - AZ (10 blocks), T-MOBILE USA, INC. (8 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ (5 blocks), COMCAST IP PHONE, LLC (3 blocks). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is SIERRAVIST 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.