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
— 928-526 not yet reported which blocks → QWEST CORPORATION 9636 FLAGSTAFF AZ
— 928-527 not yet reported which blocks → QWEST CORPORATION 9636 FLAGSTAFF AZ
— 928-528 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 SHOW LOW AZ
— 928-530 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KINGMAN AZ
— 928-532 not yet reported which blocks → CITIZENS TELECOM CO OF WHITE MOUNTAINS INC. 4426 SHOW LOW AZ
— 928-535 1XXX2XXX · 2 holders which blocks → CITIZENS TELECOM CO OF WHITE MOUNTAINS INC. 4426 HEBER AZ
— 928-536 not yet reported which blocks → CITIZENS TELECOM CO OF WHITE MOUNTAINS INC. 4426 SNOWFLAKE AZ
— 928-537 not yet reported which blocks → CITIZENS TELECOM CO OF WHITE MOUNTAINS INC. 4426 SHOW LOW AZ
— 928-539 8XXX which blocks → QWEST CORPORATION 9636 YUMA AZ
— 928-541 6XXX which blocks → QWEST CORPORATION 9636 PRESCOTT AZ
— 928-543 1XXX6XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - AZ 630E WICKENBURG AZ
— 928-552 not yet reported which blocks → QWEST CORPORATION 9636 SAFFORD AZ
— 928-554 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 SEDONA AZ
— 928-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST AZ
— 928-556 not yet reported which blocks → QWEST CORPORATION 9636 FLAGSTAFF AZ
— 928-563 not yet reported which blocks → ONVOY, LLC - AZ 630E FLAGSTAFF AZ
— 928-564 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 MEADVIEW AZ
— 928-565 0XXX1XXX6XXX8XXX · 4 holders which blocks → CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 KINGMAN AZ
— 928-566 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K LKHAVASUCY AZ
— 928-567 not yet reported which blocks → QWEST CORPORATION 9636 SEDONA AZ
— 928-569 not yet reported which blocks → ONVOY, LLC - AZ 630E FLAGSTAFF AZ
— 928-575 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K PARKER AZ
— 928-577 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 MOHAVE VLY AZ
— 928-580 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 YUMA AZ
— 928-581 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 YUMA AZ
— 928-585 not yet reported which blocks → ONVOY, LLC - AZ 630E WINSLOW AZ
— 928-587 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WINSLOW AZ
— 928-588 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 WICKENBURG AZ
— 928-589 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 WINSLOW AZ
— 928-592 1XXX2XXX3XXX5XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 SEDONA AZ
— 928-593 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → METROPCS, INC. 5562 SEDONA AZ
— 928-595 4XXX5XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PAYSON AZ
— 928-596 0XXX3XXX4XXX8XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 PAYSON AZ
— 928-597 not yet reported which blocks → ONVOY, LLC - AZ 630E YUMA AZ
— 928-599 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 GRANDCNYON AZ
— 928-600 8XXX which blocks → T-MOBILE USA, INC. 6529 FLAGSTAFF AZ
— 928-606 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 FLAGSTAFF AZ
— 928-607 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 FLAGSTAFF AZ
— 928-608 3XXX5XXX · 2 holders which blocks → QWEST CORPORATION 9636 PAGE AZ
— 928-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AZ
— 928-612 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PAGE AZ
— 928-613 2XXX9XXX · 2 holders which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 WINSLOW AZ
— 928-614 2XXX3XXX5XXX6XXX7XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PAGE AZ
— 928-627 not yet reported which blocks → QWEST CORPORATION 9636 SOMERTON AZ
— 928-632 2XXX3XXX6XXX which blocks → QWEST CORPORATION 9636 PRESCOTT AZ
— 928-633 not yet reported which blocks → TABLE TOP TELEPHONE COMPANY 3334 BAGDAD AZ
— 928-634 not yet reported which blocks → QWEST CORPORATION 9636 SEDONA AZ
— 928-635 7XXX which blocks → QWEST CORPORATION 9636 FLAGSTAFF AZ
— 928-636 not yet reported which blocks → QWEST CORPORATION 9636 PRESCOTT AZ
— 928-637 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders 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.