NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

341 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 21
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
2021-12-02 249-568 not yet reported which blocks → Fibernetics Corporation 464D Magnetawan —
2021-12-02 249-569 not yet reported which blocks → Fibernetics Corporation 464D Milford Bay —
2021-12-02 249-570 not yet reported which blocks → Fibernetics Corporation 464D Nobel —
2021-12-02 249-571 not yet reported which blocks → Fibernetics Corporation 464D Otter Lake —
2021-12-02 249-572 not yet reported which blocks → Fibernetics Corporation 464D Port Sydney —
2021-12-02 249-573 not yet reported which blocks → Fibernetics Corporation 464D South River —
2021-12-02 249-574 not yet reported which blocks → Fibernetics Corporation 464D Sprucedale —
2021-12-02 252-540 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 478J GREENVILLE NC
2021-12-02 254-484 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - TX 903C MCGREGOR TX
2021-12-02 319-388 1XXX3XXX4XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 DONNELLSON IA
2021-12-02 319-893 0–9 XXXall 10 · 5 holders which blocks → TWILIO INTERNATIONAL, INC. 506J CEDAR RPDS IA
2021-12-02 423-705 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J JOHNSON CY TN
2021-12-02 423-719 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J CHATTNOOGA TN
2021-12-02 424-468 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2021-12-02 480-847 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-12-02 517-440 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → NUSO, LLC 478J LANSING MI
2021-12-02 520-630 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - AZ 630E WILLCOX AZ
2021-12-02 623-280 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-12-02 712-895 0–9 XXXall 10 · 2 holders which blocks → TWILIO INTERNATIONAL, INC. 506J SIOUX CITY IA
2021-12-02 765-690 1XXX2XXX which blocks → NUSO, LLC 478J RICHMOND IN
2021-12-02 782-715 not yet reported which blocks → ISP Telecom Inc. 4727 Shubenacadie —
2021-12-02 782-716 not yet reported which blocks → ISP Telecom Inc. 4727 Southampton —
2021-12-02 782-717 not yet reported which blocks → ISP Telecom Inc. 4727 Springhill —
2021-12-02 782-808 not yet reported which blocks → ISP Telecom Inc. 4727 Stewiacke —
2021-12-02 782-809 not yet reported which blocks → ISP Telecom Inc. 4727 Truro —
2021-12-02 906-351 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → NUSO, LLC 478J MARQUETTE MI
2021-12-02 912-641 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - GA 983E LYONS GA
2021-12-02 920-873 0–9 XXXall 10 · 8 holders which blocks → TWILIO INTERNATIONAL, INC. 506J GREEN BAY WI
2021-12-02 949-227 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 IRVINE CA
2021-12-01 252-554 0XXX1XXX4XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 WELDON NC
2021-12-01 680-229 6XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J ONTARIO NY
2021-11-30 249-632 not yet reported which blocks → Fibernetics Corporation 464D Kirkfield —
2021-11-30 249-634 not yet reported which blocks → Fibernetics Corporation 464D Oakwood —
2021-11-30 249-635 not yet reported which blocks → Fibernetics Corporation 464D Woodville —
2021-11-30 254-480 0XXX1XXX2XXX3XXX8XXX · 4 holders which blocks → TWILIO INTERNATIONAL, INC. 506J WACO TX
2021-11-30 361-895 0–9 XXXall 10 · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J C CHRISTI TX
2021-11-30 618-810 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HERRIN IL
2021-11-30 618-813 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTRALIA IL
2021-11-30 782-508 not yet reported which blocks → ISP Telecom Inc. 4727 Debert —
2021-11-30 782-509 not yet reported which blocks → ISP Telecom Inc. 4727 Hantsport —
2021-11-30 782-551 not yet reported which blocks → ISP Telecom Inc. 4727 Kennetcook —
2021-11-30 782-552 not yet reported which blocks → ISP Telecom Inc. 4727 Liverpool —
2021-11-30 782-623 not yet reported which blocks → ISP Telecom Inc. 4727 Lunenburg —
2021-11-30 782-624 not yet reported which blocks → ISP Telecom Inc. 4727 New Ross —
2021-11-30 782-625 not yet reported which blocks → ISP Telecom Inc. 4727 Noel —
2021-11-30 858-533 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H HARBSNALPN CA
2021-11-30 930-228 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J NEW ALBANY IN
2021-11-29 249-630 not yet reported which blocks → Fibernetics Corporation 464D Cameron —
2021-11-29 249-631 not yet reported which blocks → Fibernetics Corporation 464D Dunsford —
2021-11-29 743-241 0–9 XXXall 10 · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - NC 8389 BURLINGTON NC

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.