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
2001-04-16 928-486 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LKHAVASUCY AZ
2001-03-27 928-438 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - AZ 630E FLAGSTAFF AZ
2001-03-19 928-412 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LKHAVASUCY AZ
2001-03-12 928-279 0XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 KINGMAN AZ
2001-03-08 928-306 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 SHOW LOW AZ
2001-02-28 928-864 0XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 FLAGSTAFF AZ
2001-02-22 928-583 2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 PRESCOTT AZ
— 928-200 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 GLOBE AZ
— 928-201 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BULLHEADCY AZ
— 928-203 3XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9636 SEDONA AZ
— 928-204 not yet reported which blocks → QWEST CORPORATION 9636 SEDONA AZ
— 928-210 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 YUMA AZ
— 928-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AZ
— 928-213 not yet reported which blocks → QWEST CORPORATION 9636 FLAGSTAFF AZ
— 928-214 not yet reported which blocks → QWEST CORPORATION 9636 FLAGSTAFF AZ
— 928-217 0XXX5XXX9XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 YUMA AZ
— 928-219 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K BULLHEADCY AZ
— 928-220 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 FLAGSTAFF AZ
— 928-221 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FLAGSTAFF AZ
— 928-222 not yet reported which blocks → ONVOY, LLC - AZ 630E FLAGSTAFF AZ
— 928-223 not yet reported which blocks → ONVOY, LLC - AZ 630E FLAGSTAFF AZ
— 928-226 not yet reported which blocks → QWEST CORPORATION 9636 FLAGSTAFF AZ
— 928-227 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PRESCOTT AZ
— 928-231 5XXX6XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WICKENBURG AZ
— 928-233 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 FLAGSTAFF AZ
— 928-244 not yet reported which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 YUMA AZ
— 928-246 none assigned yet which blocks → T-MOBILE USA, INC. 6529 YUMA AZ
— 928-252 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J LKPLEASANT AZ
— 928-253 not yet reported which blocks → NORTH COUNTY COMMUNICATIONS CORPORATION 8293 PRESCOTT AZ
— 928-254 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 SEDONA AZ
— 928-255 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 FLAGSTAFF AZ
— 928-257 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 YUMA AZ
— 928-261 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 YUMA AZ
— 928-262 not yet reported which blocks → NORTH COUNTY COMMUNICATIONS CORPORATION 8293 YUMA AZ
— 928-264 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CSC VOICE, LLC 612K EHRENBERG AZ
— 928-266 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CSC VOICE, LLC 612K FLAGSTAFF AZ
— 928-267 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - AZ 630E PAYSON AZ
— 928-268 not yet reported which blocks → ONVOY, LLC - AZ 630E FLAGSTAFF AZ
— 928-269 not yet reported which blocks → QWEST CORPORATION 9636 YUMA AZ
— 928-272 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - AZ 630E GRANDCNYON AZ
— 928-273 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PRESCOTT AZ
— 928-274 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEDONA AZ
— 928-277 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PRESCOTT AZ
— 928-282 not yet reported which blocks → QWEST CORPORATION 9636 SEDONA AZ
— 928-283 not yet reported which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 TUBA CITY AZ
— 928-284 7XXX8XXX which blocks → QWEST CORPORATION 9636 SEDONA AZ
— 928-286 3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9636 FLAGSTAFF AZ
— 928-288 0XXX2XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9636 WINSLOW AZ
— 928-289 not yet reported which blocks → QWEST CORPORATION 9636 WINSLOW AZ
— 928-300 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SEDONA 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.