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
2005-03-02 928-466 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 CASTLEROCK AZ
2004-09-22 928-310 3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 FLAGSTAFF AZ
2004-09-22 928-420 7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PRESCOTT AZ
2004-09-22 928-451 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEDONA AZ
2004-08-19 928-322 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SAFFORD AZ
2004-08-19 928-377 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KINGMAN AZ
2004-03-29 928-249 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LKMHVRNCHS AZ
2004-03-25 928-218 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MEADVIEW AZ
2004-03-23 928-216 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PARKER AZ
2003-08-15 928-642 0–9 XXXall 10 · 4 holders which blocks → QWEST CORPORATION 9636 PRESCOTT AZ
2003-04-03 928-215 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CLIFTON AZ
2002-12-31 928-240 5XXX6XXX7XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 HEBER AZ
2002-12-31 928-241 5XXX7XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 HOLBROOK AZ
2002-12-31 928-242 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PINETOP AZ
2002-12-31 928-243 9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SNOWFLAKE AZ
2002-12-31 928-245 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SPRINGERVL AZ
2002-11-26 928-209 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 PAGE AZ
2002-11-14 928-208 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 LKHAVASUCY AZ
2002-10-30 928-205 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 SHOW LOW AZ
2002-10-30 928-206 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 TUBA CITY AZ
2002-10-30 928-207 not yet reported which blocks → SMITH BAGLEY INC. DBA CELLULAR ONE OF NE ARIZONA 4146 SHOW LOW AZ
2002-09-17 928-230 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 LKHAVASUCY AZ
2002-09-17 928-852 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SEDONA AZ
2002-08-28 928-862 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 SEDONA AZ
2002-08-28 928-863 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 FLAGSTAFF AZ
2002-08-16 928-202 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SEDONA AZ
2002-08-15 928-722 2XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 SOMERTON AZ
2002-08-07 928-237 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PRESCOTT AZ
2002-08-07 928-238 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PAYSON AZ
2002-08-07 928-239 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SEDONA AZ
2002-07-03 928-232 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 WICKENBURG AZ
2002-04-17 928-533 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PRESCOTT AZ
2002-04-09 928-792 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SAFFORD AZ
2002-04-09 928-793 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 GLOBE AZ
2002-04-04 928-224 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 WINSLOW AZ
2002-04-02 928-999 not yet reported which blocks → MIDVALE TELEPHONE EXCHANGE, INC. 2226 MILLSITE AZ
2002-01-31 928-225 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 FLAGSTAFF AZ
2002-01-29 928-399 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SEDONA AZ
2002-01-29 928-458 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PRESCOTT AZ
2002-01-15 928-446 0XXX3XXX4XXX5XXX7XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 YUMA AZ
2002-01-15 928-848 2XXX6XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 PRESCOTT AZ
2001-12-18 928-502 3XXX4XXX5XXX6XXX7XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 YUMA AZ
2001-12-18 928-965 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SAFFORD AZ
2001-11-19 928-234 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BULLHEADCY AZ
2001-11-19 928-846 3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LKHAVASUCY AZ
2001-11-19 928-897 3XXX4XXX5XXX7XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KINGMAN AZ
2001-09-04 928-814 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FLAGSTAFF AZ
2001-08-15 928-542 0XXX2XXX3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 BULLHEADCY AZ
2001-05-31 928-303 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 KINGMAN AZ
2001-04-16 928-415 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 WICKENBURG 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.