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
2021-03-05 928-798 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - AZ 630E YUMA AZ
2021-02-28 928-610 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - AZ 630E BULLHEADCY AZ
2021-02-01 928-403 0XXX1XXX2XXX6XXX7XXX · 3 holders which blocks → TELNYX LLC 073H PEACH SPG AZ
2020-12-24 928-598 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - AZ 630E WIKIEUP AZ
2020-12-23 928-397 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - AZ 630E CASTLEROCK AZ
2020-12-23 928-416 0XXX1XXX3XXX8XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H MEADVIEW AZ
2020-12-23 928-449 0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → ONVOY, LLC - AZ 630E LKMHVRNCHS AZ
2020-12-23 928-519 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - AZ 630E MOHAVE VLY AZ
2020-12-22 928-381 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - AZ 630E GRANDCNYON AZ
2020-12-22 928-393 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - AZ 630E PIMA AZ
2020-12-22 928-394 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - AZ 630E BOUSE AZ
2020-12-08 928-398 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - AZ 630E SOMERTON AZ
2020-12-08 928-889 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - AZ 630E LKHAVASUCY AZ
2020-12-08 928-981 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - AZ 630E FLAGSTAFF AZ
2020-11-09 928-968 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - AZ 630E PRESCOTT AZ
2020-11-04 928-837 0XXX1XXX2XXX3XXX4XXX6XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J YUCCA AZ
2020-10-22 928-538 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - AZ 630E BULLHEADCY AZ
2020-10-02 928-644 4XXX6XXX · 2 holders which blocks → FRACTEL, LLC 965H COLORADOCY AZ
2020-10-02 928-744 4XXX6XXX7XXX · 3 holders which blocks → FRACTEL, LLC 965H ALPINE AZ
2020-10-02 928-822 2XXX4XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H FREDONIA AZ
2020-10-02 928-844 4XXX8XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H LITTLEFLD AZ
2020-10-02 928-866 2XXX6XXX8XXX · 3 holders which blocks → FRACTEL, LLC 965H MESQUITCRK AZ
2020-10-02 928-944 4XXX9XXX · 2 holders which blocks → FRACTEL, LLC 965H AZ VILLAGE AZ
2020-10-02 928-946 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H SAFFORD AZ
2020-10-02 928-966 3XXX6XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H SAN CARLOS AZ
2020-09-24 928-465 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H BULLHDCYN AZ
2020-08-25 928-307 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - AZ 630E PAGE AZ
2020-08-03 928-392 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 LKHAVASUCY AZ
2020-07-28 928-391 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 KINGMAN AZ
2020-07-22 928-374 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WIKIEUP AZ
2020-07-16 928-628 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - AZ 630E KINGMAN AZ
2020-07-14 928-385 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 KINGMAN AZ
2020-06-16 928-364 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → ONVOY, LLC - AZ 630E BLUE RIDGE AZ
2020-06-16 928-365 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - AZ 630E GREENEHVN AZ
2020-06-16 928-370 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - AZ 630E MARBLECNYN AZ
2020-06-16 928-371 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX which blocks → ONVOY, LLC - AZ 630E MORMONLAKE AZ
2020-06-16 928-378 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - AZ 630E ROOSEVLTLK AZ
2020-06-16 928-382 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - AZ 630E SALOME AZ
2020-06-16 928-384 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - AZ 630E SUPAI AZ
2020-06-02 928-544 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H CASTLEROCK AZ
2020-06-02 928-842 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H PARKER AZ
2020-06-02 928-877 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRACTEL, LLC 965H PARKER DAM AZ
2020-06-02 928-918 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - AZ 630E HARQUHLVLY AZ
2020-06-02 928-938 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - AZ 630E HYDER AZ
2020-06-02 928-977 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H YUMA AZ
2020-05-11 928-360 0XXX1XXX · 2 holders which blocks → COMMNET WIRELESS, LLC 5736 CHINLE AZ
2020-04-15 928-361 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F PIMA AZ
2020-03-25 928-270 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 SPRINGERVL AZ
2019-12-02 928-455 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - AZ 630E PEACH SPG AZ
2019-10-31 928-357 0XXX4XXX6XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 WINDOWROCK 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.