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
2012-01-25 928-212 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - AZ 630E PAGE AZ
2011-11-22 928-248 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K YUMA AZ
2011-10-21 928-319 2XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DILKON AZ
2011-10-21 928-489 0XXX1XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 KAYENTA AZ
2011-04-28 928-258 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 AGUILA AZ
2011-02-03 928-815 4XXX which blocks → NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 4449 WINDOWROCK AZ
2010-10-15 928-275 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 GLOBE AZ
2010-10-15 928-363 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PAYSON AZ
2010-09-03 928-228 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F PIMA AZ
2010-07-23 928-514 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BULLHEADCY AZ
2010-06-01 928-325 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 SEDONA AZ
2010-05-26 928-280 7XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TUBA CITY AZ
2010-05-26 928-730 3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FTDEFIANCE AZ
2010-03-15 928-259 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 YUMA AZ
2010-03-10 928-235 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SAFFORD AZ
2010-03-09 928-366 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 YUMA AZ
2009-11-05 928-515 0–9 XXXall 10 · 5 holders which blocks → QWEST CORPORATION 9636 PRESCOTT AZ
2009-10-06 928-940 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PINETOP AZ
2009-02-11 928-750 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 YUMA AZ
2008-03-20 928-387 0XXX1XXX2XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9636 SAFFORD AZ
2008-01-07 928-551 6XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SPRINGERVL AZ
2007-09-07 928-315 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 SOMERTON AZ
2007-06-26 928-487 0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 GLOBE AZ
2007-05-03 928-263 0–9 XXXall 10 · 5 holders which blocks → CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 2172 KINGMAN AZ
2007-03-15 928-247 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 YUMA AZ
2007-03-08 928-457 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SNOWFLAKE AZ
2007-02-05 928-304 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 YUMA AZ
2006-12-27 928-297 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 HOLBROOK AZ
2006-10-12 928-432 0–9 XXXall 10 · 6 holders which blocks → QWEST CORPORATION 9636 SAFFORD AZ
2006-10-05 928-251 0XXX1XXX2XXX3XXX4XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SHOW LOW AZ
2006-08-16 928-401 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 TUBA CITY AZ
2006-08-07 928-276 0–9 XXXall 10 · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K YUMA AZ
2006-06-12 928-287 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 YUMA AZ
2006-06-06 928-358 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PINETOP AZ
2006-03-28 928-349 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 CHINLE AZ
2006-03-28 928-429 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 KAYENTA AZ
2006-03-28 928-675 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 PINONCTNWD AZ
2006-03-08 928-271 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 YUMA AZ
2006-02-16 928-292 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CLIFTON AZ
2006-01-31 928-488 none assigned yet which blocks → T-MOBILE USA, INC. 6529 YUMA AZ
2005-12-21 928-424 not yet reported which blocks → VALLEY CONNECTIONS, L.L.C. - AZ 183D SAFFORD AZ
2005-12-20 928-229 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 SNOWFLAKE AZ
2005-12-20 928-321 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 ST JOHNS AZ
2005-12-20 928-409 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 HEBER AZ
2005-12-20 928-594 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 WHITERIVER AZ
2005-12-20 928-751 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 SPRINGERVL AZ
2005-12-16 928-313 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 HOLBROOK AZ
2005-10-31 928-797 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 TUBA CITY AZ
2005-06-02 928-550 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SOMERTON AZ
2005-03-29 928-434 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 SHOW LOW 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.