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
2019-09-13 928-356 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H PRESCOTT AZ
2019-05-28 928-352 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - AZ 630E KINGMAN AZ
2019-03-27 928-419 0–9 XXXall 10 · 7 holders which blocks → CSC WIRELESS, LLC 425J FLAGSTAFF AZ
2019-02-20 928-500 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → TERRA NOVA TELECOM INC. 145J AGUILA AZ
2019-01-25 928-666 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H FLAGSTAFF AZ
2018-12-03 928-327 0–9 XXXall 10 · 6 holders which blocks → VONAGE AMERICA LLC 197D PRESCOTT AZ
2018-08-31 928-900 0–9 XXXall 10 · 6 holders which blocks → TERRA NOVA TELECOM INC. 145J GLOBE AZ
2018-08-09 928-281 0XXX1XXX6XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SELIGMAN AZ
2018-08-09 928-290 0XXX1XXX2XXX3XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 BAGDAD AZ
2018-06-28 928-260 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - AZ 630E WIKIEUP AZ
2018-06-14 928-655 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SOMERTON AZ
2018-05-25 928-497 1XXX which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 KYKTSMOVLG AZ
2017-05-15 928-882 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F WINSLOW AZ
2017-04-25 928-800 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - AZ 630E PRESCOTT AZ
2017-03-16 928-296 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 BULLHEADCY AZ
2017-03-03 928-929 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → WIDE VOICE, LLC - AZ 410H GILA BEND AZ
2017-01-18 928-471 0–9 XXXall 10 · 4 holders which blocks → QWEST CORPORATION 9636 PAYSON AZ
2017-01-05 928-294 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 YUMA AZ
2016-10-10 928-582 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PRESCOTT AZ
2016-07-15 928-256 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 YUMA AZ
2016-07-13 928-291 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - AZ 630E YUMA AZ
2016-06-09 928-250 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 SAFFORD AZ
2016-04-21 928-326 0–9 XXXall 10 · 4 holders which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 FLAGSTAFF AZ
2016-02-29 928-663 0XXX1XXX8XXX9XXX · 3 holders which blocks → WAVENATION, LLC 700J CHINLE AZ
2016-02-10 928-236 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - AZ 630E SOMERTON AZ
2015-11-17 928-955 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K YUMA AZ
2015-08-28 928-558 0XXX1XXX7XXX8XXX9XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J GREER AZ
2015-06-29 928-331 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F GILA BEND AZ
2015-06-05 928-316 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J PIMA AZ
2015-03-13 928-605 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BULLHEADCY AZ
2015-01-23 928-985 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F SAFFORD AZ
2015-01-22 928-312 0XXX2XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 INCRPTCNYN AZ
2015-01-19 928-615 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 YUMA AZ
2014-08-28 928-383 0XXX1XXX7XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CHINLE AZ
2014-07-24 928-295 0–9 XXXall 10 · 5 holders which blocks → AT&T - LOCAL 7421 SEDONA AZ
2014-06-04 928-318 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - AZ 630E YUMA AZ
2014-03-03 928-421 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F WINSLOW AZ
2014-02-06 928-299 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K BULLHEADCY AZ
2014-02-06 928-529 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K KINGMAN AZ
2013-11-05 928-440 0–9 XXXall 10 · 3 holders which blocks → CSC VOICE, LLC 612K FLAGSTAFF AZ
2013-11-05 928-733 0–9 XXXall 10 · 3 holders which blocks → CSC VOICE, LLC 612K LKHAVASUCY AZ
2013-06-14 928-293 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 KINGMAN AZ
2013-03-15 928-298 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PIMA AZ
2013-02-13 928-723 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - AZ 630E YUMA AZ
2012-12-19 928-278 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 BULLHEADCY AZ
2012-08-08 928-285 0–9 XXXall 10 · 4 holders which blocks → AT&T - LOCAL 7421 SOMERTON AZ
2012-06-29 928-494 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SEDONA AZ
2012-06-22 928-362 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 SAFFORD AZ
2012-05-18 928-323 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SOMERTON AZ
2012-02-29 928-439 0XXX2XXX4XXX7XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 DUNCAN 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.