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
— 928-301 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SEDONA AZ
— 928-302 0–9 XXXall 10 · 7 holders which blocks → CSC VOICE, LLC 612K LKHAVASUCY AZ
— 928-305 not yet reported which blocks → QWEST CORPORATION 9636 YUMA AZ
— 928-308 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PRESCOTT AZ
— 928-309 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 WINDOWROCK AZ
— 928-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AZ
— 928-314 not yet reported which blocks → QWEST CORPORATION 9636 YUMA AZ
— 928-317 not yet reported which blocks → QWEST CORPORATION 9636 YUMA AZ
— 928-324 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - AZ 630E SAFFORD AZ
— 928-328 0XXX1XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 YUMA AZ
— 928-329 not yet reported which blocks → QWEST CORPORATION 9636 YUMA AZ
— 928-330 not yet reported which blocks → FORT MOJAVE TELECOM INC 2200 MESQUITCRK AZ
— 928-332 1XXX3XXX5XXX · 3 holders which blocks → CITIZENS TELECOM CO OF WHITE MOUNTAINS INC. 4426 WHITERIVER AZ
— 928-333 not yet reported which blocks → CITIZENS TELECOM CO OF WHITE MOUNTAINS INC. 4426 SPRINGERVL AZ
— 928-334 none assigned yet which blocks → CITIZENS TELECOM CO OF WHITE MOUNTAINS INC. 4426 WHITERIVER AZ
— 928-335 none assigned yet which blocks → CITIZENS TELECOM CO OF WHITE MOUNTAINS INC. 4426 WHITERIVER AZ
— 928-336 0XXX8XXX which blocks → QWEST CORPORATION 9636 YUMA AZ
— 928-337 1XXX8XXX · 2 holders which blocks → CITIZENS TELECOM CO OF WHITE MOUNTAINS INC. 4426 ST JOHNS AZ
— 928-338 6XXX7XXX9XXX · 2 holders which blocks → CITIZENS TELECOM CO OF WHITE MOUNTAINS INC. 4426 WHITERIVER AZ
— 928-339 2XXX3XXX5XXX7XXX8XXX · 4 holders which blocks → CITIZENS TELECOM CO OF WHITE MOUNTAINS INC. 4426 ALPINE AZ
— 928-340 0XXX6XXX7XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 SEDONA AZ
— 928-341 3XXX5XXX which blocks → QWEST CORPORATION 9636 YUMA AZ
— 928-342 not yet reported which blocks → QWEST CORPORATION 9636 YUMA AZ
— 928-343 not yet reported which blocks → QWEST CORPORATION 9636 YUMA AZ
— 928-344 not yet reported which blocks → QWEST CORPORATION 9636 YUMA AZ
— 928-345 5XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 YUMA AZ
— 928-346 not yet reported which blocks → FORT MOJAVE TELECOM INC 2200 AZ VILLAGE AZ
— 928-347 not yet reported which blocks → RIO VIRGIN TEL. CO., INC. 2356 LITTLEFLD AZ
— 928-348 not yet reported which blocks → QWEST CORPORATION 9636 SAFFORD AZ
— 928-350 0XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 PRESCOTT AZ
— 928-351 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 GLOBE AZ
— 928-353 3XXX which blocks → ARIZONA TEL. CO. 2171 GREENEHVN AZ
— 928-354 none assigned yet which blocks → ARIZONA TEL. CO. 2171 MORMONLAKE AZ
— 928-355 5XXX which blocks → ARIZONA TEL. CO. 2171 MARBLECNYN AZ
— 928-359 not yet reported which blocks → VALLEY TEL COOP INC 2176 DUNCAN AZ
— 928-367 not yet reported which blocks → CITIZENS TELECOM CO OF WHITE MOUNTAINS INC. 4426 PINETOP AZ
— 928-368 3XXX7XXX9XXX · 2 holders which blocks → CITIZENS TELECOM CO OF WHITE MOUNTAINS INC. 4426 PINETOP AZ
— 928-369 6XXX8XXX9XXX · 2 holders which blocks → CITIZENS TELECOM CO OF WHITE MOUNTAINS INC. 4426 PINETOP AZ
— 928-372 none assigned yet which blocks → ARIZONA TEL. CO. 2171 HARQUHLVLY AZ
— 928-373 7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 YUMA AZ
— 928-376 not yet reported which blocks → QWEST CORPORATION 9636 YUMA AZ
— 928-379 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PRESCOTT AZ
— 928-380 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FLAGSTAFF AZ
— 928-386 4XXX6XXX7XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WINSLOW AZ
— 928-388 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 YUMA AZ
— 928-389 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - AZ 630E EHRENBERG AZ
— 928-395 not yet reported which blocks → ONVOY, LLC - AZ 630E FLAGSTAFF AZ
— 928-396 not yet reported which blocks → ONVOY, LLC - AZ 630E FLAGSTAFF AZ
— 928-402 2XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9636 GLOBE AZ
— 928-404 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K BULLHDCYN 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.