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
— 928-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AZ
— 928-414 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 HOLBROOK AZ
— 928-422 not yet reported which blocks → TABLE TOP TELEPHONE COMPANY 3334 SELIGMAN AZ
— 928-425 not yet reported which blocks → QWEST CORPORATION 9636 GLOBE AZ
— 928-427 1XXX2XXX5XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 WICKENBURG AZ
— 928-428 not yet reported which blocks → QWEST CORPORATION 9636 SAFFORD AZ
— 928-433 0–9 XXXall 10 · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 FLAGSTAFF AZ
— 928-436 1XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 GILA BEND AZ
— 928-437 not yet reported which blocks → ONVOY, LLC - AZ 630E GRANDCNYON AZ
— 928-441 not yet reported which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 PRESCOTT AZ
— 928-442 6XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9636 PRESCOTT AZ
— 928-443 not yet reported which blocks → QWEST CORPORATION 9636 PRESCOTT AZ
— 928-444 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K BULLHEADCY AZ
— 928-445 not yet reported which blocks → QWEST CORPORATION 9636 PRESCOTT AZ
— 928-447 not yet reported which blocks → ONVOY, LLC - AZ 630E FLAGSTAFF AZ
— 928-448 8XXX which blocks → ARIZONA TEL. CO. 2171 SUPAI AZ
— 928-453 not yet reported which blocks → CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 LKHAVASUCY AZ
— 928-454 4XXX which blocks → ARIZONA TEL. CO. 2171 HYDER AZ
— 928-459 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 YUMA AZ
— 928-460 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PRESCOTT AZ
— 928-462 not yet reported which blocks → MIDVALE TELEPHONE EXCHANGE, INC. 2226 YOUNG AZ
— 928-467 4XXX5XXX which blocks → ARIZONA TEL. CO. 2171 ROOSEVLTLK AZ
— 928-468 3XXX4XXX · 2 holders which blocks → QWEST CORPORATION 9636 PAYSON AZ
— 928-472 none assigned yet which blocks → QWEST CORPORATION 9636 PAYSON AZ
— 928-473 0XXX1XXX5XXX · 3 holders which blocks → QWEST CORPORATION 9636 GLOBE AZ
— 928-474 not yet reported which blocks → QWEST CORPORATION 9636 PAYSON AZ
— 928-475 not yet reported which blocks → SAN CARLOS APACHE TELECOMMUNICATIONS UTILITY, INC. 2169 SAN CARLOS AZ
— 928-476 0XXX1XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9636 PAYSON AZ
— 928-477 3XXX7XXX which blocks → ARIZONA TEL. CO. 2171 BLUE RIDGE AZ
— 928-478 1XXX2XXX6XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 PAYSON AZ
— 928-479 3XXX which blocks → ARIZONA TEL. CO. 2171 ROOSEVLTLK AZ
— 928-482 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → LEVEL 3 TELECOM OF ARIZONA, LLC - AZ 7552 GILA BEND AZ
— 928-484 not yet reported which blocks → ONVOY, LLC - AZ 630E PAGE AZ
— 928-485 1XXX4XXX5XXX6XXX · 3 holders which blocks → QWEST CORPORATION 9636 PIMA AZ
— 928-492 not yet reported which blocks → ONVOY, LLC - AZ 630E PAYSON AZ
— 928-493 not yet reported which blocks → ONVOY, LLC - AZ 630E PRESCOTT AZ
— 928-496 not yet reported which blocks → ONVOY, LLC - AZ 630E SEDONA AZ
— 928-498 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 SNOWFLAKE AZ
— 928-499 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PRESCOTT AZ
— 928-501 not yet reported which blocks → ACCIPITER COMMUNICATIONS INC 2191 LKPLEASANT AZ
— 928-503 5XXX6XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 YUMA AZ
— 928-504 not yet reported which blocks → ONVOY, LLC - AZ 630E SOMERTON AZ
— 928-505 not yet reported which blocks → CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 LKHAVASUCY AZ
— 928-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AZ
— 928-517 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PAYSON AZ
— 928-521 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 SHOW LOW AZ
— 928-522 3XXX4XXX which blocks → QWEST CORPORATION 9636 FLAGSTAFF AZ
— 928-523 not yet reported which blocks → QWEST CORPORATION 9636 FLAGSTAFF AZ
— 928-524 none assigned yet which blocks → CITIZENS TELECOM CO OF WHITE MOUNTAINS INC. 4426 HOLBROOK AZ
— 928-525 4XXX6XXX which blocks → QWEST CORPORATION 9636 FLAGSTAFF 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.