NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 27
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2018-06-07 587-427 not yet reported which blocks → Distributel 081E Wabamun —
2018-06-07 587-670 not yet reported which blocks → Distributel 081E Wildwood —
2018-06-07 814-351 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D ERIE PA
2018-06-07 858-258 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG MRMS CA
2018-06-07 873-515 not yet reported which blocks → Distributel 083E Champlain —
2018-06-07 873-520 not yet reported which blocks → Distributel 083E Ste-Monique-de-Nicolet —
2018-06-07 873-521 not yet reported which blocks → Distributel 083E Ste-Sophie-de-Levrard —
2018-06-07 873-522 not yet reported which blocks → Distributel 083E St-Pierre-Les-Becquets —
2018-06-07 873-523 not yet reported which blocks → Distributel 083E Yamachiche —
2018-06-07 906-729 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → VONAGE AMERICA LLC 197D CALUMET MI
2018-06-07 980-985 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC 7835 CHARLOTTE NC
2018-06-06 223-200 0–9 XXXall 10 · 2 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 YORK PA
2018-06-06 223-400 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 HANOVER PA
2018-06-06 256-742 0XXX1XXX2XXX6XXX8XXX9XXX · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K ELKMONT AL
2018-06-06 260-261 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → VONAGE AMERICA LLC 197D SALAMONIA IN
2018-06-06 272-400 0–9 XXXall 10 · 5 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 LAKE ARIEL PA
2018-06-06 325-244 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D ABILENE TX
2018-06-06 406-717 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D BILLINGS MT
2018-06-06 409-245 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D BEAUMONT TX
2018-06-06 412-842 0–9 XXXwhole prefix which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON1 PA
2018-06-06 432-243 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D MIDLAND TX
2018-06-06 445-200 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 QUAKERTOWN PA
2018-06-06 581-503 not yet reported which blocks → Iristel Inc. 154E Maria —
2018-06-06 581-504 not yet reported which blocks → Iristel Inc. 154E Matane —
2018-06-06 581-505 not yet reported which blocks → Iristel Inc. 154E Sept-Iles —
2018-06-06 581-732 not yet reported which blocks → Bell Canada 984C Saint-Jean-Port-Joli —
2018-06-06 581-733 not yet reported which blocks → Bell Canada 984C Saint-Paul-de-Montminy —
2018-06-06 581-734 not yet reported which blocks → Bell Canada 984C Saint-Roch-des-Aulnaies —
2018-06-06 610-215 0–9 XXXall 10 · 6 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN30 PA
2018-06-06 631-710 0–9 XXXall 10 · 3 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 RONKONKOMA NY
2018-06-06 647-314 not yet reported which blocks → Bell Mobility 6574 Toronto —
2018-06-06 774-362 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 ATTLEBORO MA
2018-06-06 806-641 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → VONAGE AMERICA LLC 197D AMARILLO TX
2018-06-06 806-642 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D LUBBOCK TX
2018-06-06 814-500 0–9 XXXall 10 · 6 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 HUNTINGDON PA
2018-06-06 940-276 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D WICHITAFLS TX
2018-06-05 302-842 0–9 XXXall 10 · 4 holders which blocks → CORETEL DELAWARE, INC. - DE 1991 WILMINGTON DE
2018-06-05 434-459 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D CHARLOTSVL VA
2018-06-05 434-499 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D LYNCHBURG VA
2018-06-05 445-500 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN40 PA
2018-06-05 445-600 0–9 XXXall 10 · 5 holders which blocks → CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN39 PA
2018-06-05 506-571 not yet reported which blocks → Distributel 081E Albert —
2018-06-05 506-572 not yet reported which blocks → Distributel 081E Alma —
2018-06-05 506-573 not yet reported which blocks → Distributel 081E Hillsborough —
2018-06-05 506-574 not yet reported which blocks → Distributel 081E Port Elgin —
2018-06-05 531-557 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9631 OMAHA NE
2018-06-05 563-526 0–9 XXXall 10 · 6 holders which blocks → VONAGE AMERICA LLC 197D DAVENPORT IA
2018-06-05 581-554 not yet reported which blocks → TELUS Quebec 8083 Saint-Henri-de-Levis —
2018-06-05 581-730 not yet reported which blocks → Bell Canada 984C L'Islet —
2018-06-05 581-731 not yet reported which blocks → Bell Canada 984C Saint-Francois —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.