NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 928
QWEST CORPORATION 95
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 91
ONVOY, LLC - AZ 66
NEW CINGULAR WIRELESS PCS, LLC 43
T-MOBILE USA, INC. 40
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2022-08-12 928-435 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 BULLHEADCY AZ
2022-06-01 928-320 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PIMA AZ
2022-05-18 928-483 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 YUMA AZ
2022-05-16 928-867 0–9 XXXall 10 · 4 holders which blocks → COMMIO, LLC 939H KINGMAN AZ
2022-05-10 928-375 0XXX1XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALOME AZ
2022-03-09 928-390 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SOMERTON AZ
2022-02-24 928-836 2XXX3XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J HEBER AZ
2022-02-17 928-534 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J SAFFORD AZ
2022-02-17 928-622 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J FLAGSTAFF AZ
2022-02-16 928-624 5XXX which blocks → TON80 COMMUNICATIONS, LLC 516J QUARTZSITE AZ
2022-02-16 928-625 0XXX5XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J PARKER DAM AZ
2022-02-16 928-743 7XXX which blocks → TON80 COMMUNICATIONS, LLC 516J BOUSE AZ
2022-02-16 928-876 0XXX1XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J EHRENBERG AZ
2022-02-10 928-664 2XXX4XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CIBOLA AZ
2022-02-10 928-746 7XXX which blocks → TON80 COMMUNICATIONS, LLC 516J HARQUHLVLY AZ
2022-02-10 928-786 6XXX which blocks → TON80 COMMUNICATIONS, LLC 516J HYDER AZ
2022-02-10 928-843 0–9 XXXall 10 · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J SOMERTON AZ
2022-02-10 928-886 0XXX6XXX8XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ST JOHNS AZ
2022-02-09 928-481 2XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BLUE RIDGE AZ
2022-02-09 928-609 2XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 GREENEHVN AZ
2022-02-09 928-631 2XXX3XXX4XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MORMONLAKE AZ
2022-02-01 928-665 5XXX7XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J GRANDCNYON AZ
2022-01-14 928-872 1XXX3XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BULLHDCYN AZ
2022-01-13 928-878 0XXX7XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J GILA BEND AZ
2022-01-10 928-546 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BULLHEADCY AZ
2022-01-07 928-464 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 WICKENBURG AZ
2022-01-07 928-469 0XXX1XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PARKER AZ
2021-12-16 928-408 0–9 XXXall 10 · 6 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J YUMA AZ
2021-11-22 928-400 0XXX4XXX · 2 holders which blocks → FRACTEL, LLC 965H WIKIEUP AZ
2021-11-09 928-933 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H PINETOP AZ
2021-10-25 928-732 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H LKHAVASUCY AZ
2021-10-11 928-463 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 PRESCOTT AZ
2021-10-01 928-450 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BULLHEADCY AZ
2021-09-28 928-461 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NUSO, LLC 478J TUBA CITY AZ
2021-09-24 928-456 0–9 XXXall 10 · 5 holders which blocks → COMMIO, LLC 939H FLAGSTAFF AZ
2021-09-23 928-431 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BLACK MESA AZ
2021-09-23 928-452 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BONITA AZ
2021-09-23 928-545 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TEECNOSPOS AZ
2021-09-03 928-426 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J PRESCOTT AZ
2021-09-03 928-430 0–9 XXXall 10 · 5 holders which blocks → IP HORIZON LLC 515J SOMERTON AZ
2021-08-24 928-418 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 KINGMAN AZ
2021-08-23 928-423 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 FLAGSTAFF AZ
2021-08-11 928-413 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PIMA AZ
2021-07-27 928-417 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SAFFORD AZ
2021-07-19 928-410 0XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 GANADO AZ
2021-07-15 928-407 0XXX which blocks → TELNYX LLC 073H WINDOWROCK AZ
2021-05-18 928-406 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WINSLOW AZ
2021-05-04 928-405 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FLAGSTAFF AZ
2021-03-15 928-975 0–9 XXXall 10 · 5 holders which blocks → STRATUS NETWORKS 495J YUMA AZ
2021-03-11 928-898 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - AZ 630E KINGMAN AZ

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.