NumberResearch Membership · Data 09/22/2026

Recent prefix assignments

354 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026

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, last 30 days
8X8, INC. 39
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 20
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
2023-01-26 682-415 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 WEATHERFD TX
2023-01-26 873-448 not yet reported which blocks → Fibernetics Corporation 464D Drummondville —
2023-01-26 945-677 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7148 PROSPER TX
2023-01-26 945-678 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7148 MCKINNEY TX
2023-01-26 984-323 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 GOLDSBORO NC
2023-01-25 346-346 0–9 XXXall 10 · 3 holders which blocks → USFON, INC. - TX 473F FRIENDSWD TX
2023-01-25 423-550 0XXX1XXX2XXX5XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - TN 124F MIDWAY TN
2023-01-25 430-316 1XXX2XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 MIMS TX
2023-01-25 430-317 1XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HARLETON TX
2023-01-25 430-319 1XXX2XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 PRITCHETT TX
2023-01-25 430-320 0XXX1XXX2XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BETTIE TX
2023-01-25 430-321 1XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ROSEWOOD TX
2023-01-25 437-653 not yet reported which blocks → Bell Mobility 6574 Toronto —
2023-01-25 448-214 0XXX1XXX2XXX · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K BLOUNTSTN FL
2023-01-25 517-299 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E LANSING MI
2023-01-25 557-273 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-01-25 557-362 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-01-25 557-454 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-01-25 557-653 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-01-25 557-747 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-01-25 557-953 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-01-25 557-996 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-01-25 581-439 not yet reported which blocks → Iristel Inc. 346J Sainte-Anne-des-Monts —
2023-01-25 581-468 not yet reported which blocks → Iristel Inc. 346J Sainte-Anne-des-Monts —
2023-01-25 581-469 not yet reported which blocks → Iristel Inc. 346J Sainte-Anne-des-Monts —
2023-01-25 682-682 0–9 XXXall 10 · 2 holders which blocks → USFON, INC. - TX 473F ARLINGTON TX
2023-01-25 726-726 0–9 XXXall 10 · 2 holders which blocks → EVOLVE CELLULAR, INC. 139F SANANTONIO TX
2023-01-25 737-355 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F LOCKHART TX
2023-01-25 737-737 0–9 XXXall 10 · 3 holders which blocks → USFON, INC. - TX 473F SAN MARCOS TX
2023-01-25 825-562 not yet reported which blocks → Fibernetics Corporation 464D Acme —
2023-01-25 825-563 not yet reported which blocks → Fibernetics Corporation 464D Arrowwood —
2023-01-25 825-564 not yet reported which blocks → Fibernetics Corporation 464D Beiseker —
2023-01-25 825-565 not yet reported which blocks → Fibernetics Corporation 464D Blackie —
2023-01-25 825-566 not yet reported which blocks → Fibernetics Corporation 464D Bragg Creek —
2023-01-25 825-567 not yet reported which blocks → Fibernetics Corporation 464D Cayley —
2023-01-25 825-568 not yet reported which blocks → Fibernetics Corporation 464D Champion —
2023-01-25 832-832 0–9 XXXall 10 · 2 holders which blocks → USFON, INC. - TX 473F SPRING TX
2023-01-25 903-903 0–9 XXXall 10 · 3 holders which blocks → USFON, INC. - TX 473F PALESTINE TX
2023-01-25 945-945 0–9 XXXall 10 · 3 holders which blocks → USFON, INC. - TX 473F DALLAS TX
2023-01-25 959-247 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWICH CT
2023-01-24 256-991 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - AL 072F ATHENS AL
2023-01-24 319-307 4XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 DUNKERTON IA
2023-01-24 319-309 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 GUERNSEY IA
2023-01-24 319-314 5XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 READLYN IA
2023-01-24 417-603 0XXX1XXX2XXX3XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPRINGFLD MO
2023-01-24 419-416 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DELTA OH
2023-01-24 463-282 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 INDIANAPLS IN
2023-01-24 561-954 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - FL 937C WPALMBEACH FL
2023-01-24 561-960 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - FL 937C DELRAY BCH FL
2023-01-24 573-841 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CAPEGIRARD MO

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.