NumberResearch Membership · Data 09/21/2026

Recent prefix assignments

338 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026

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. 38
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
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
2023-01-24 580-787 1XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BOISE CITY OK
2023-01-24 726-233 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F SANANTONIO TX
2023-01-24 914-549 0XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 SOUTHSALEM NY
2023-01-23 206-815 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2023-01-23 206-820 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2023-01-23 206-827 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2023-01-23 206-831 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2023-01-23 206-836 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2023-01-23 234-365 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F MONTROSE OH
2023-01-23 249-712 not yet reported which blocks → TELUS Integrated Communications 2782 Kapuskasing —
2023-01-23 249-713 not yet reported which blocks → TELUS Integrated Communications 2782 Kirkland Lake —
2023-01-23 249-714 not yet reported which blocks → TELUS Integrated Communications 2782 New Liskeard —
2023-01-23 249-715 not yet reported which blocks → TELUS Integrated Communications 2782 South Porcupine —
2023-01-23 253-385 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E GRAHAM WA
2023-01-23 325-317 0XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 FREDONIA TX
2023-01-23 474-757 not yet reported which blocks → Fibernetics Corporation 464D Balcarres —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.