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
2023-02-28 432-319 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J MIDLAND TX
2023-02-28 447-250 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHARLESTON IL
2023-02-28 513-992 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - OH 464C LTL MIAMI OH
2023-02-28 516-969 0–9 XXXall 10 · 3 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 NASSAUZN05 NY
2023-02-28 579-874 not yet reported which blocks → Fibernetics Corporation 464D Cowansville —
2023-02-28 579-875 not yet reported which blocks → Fibernetics Corporation 464D Granby —
2023-02-28 646-212 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H NWYRCYZN01 NY
2023-02-28 726-237 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J SANANTONIO TX
2023-02-28 737-358 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J AUSTIN TX
2023-02-28 754-310 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - FL 937C POMPANOBCH FL
2023-02-28 873-951 not yet reported which blocks → Fibernetics Corporation 464D Aylmer —
2023-02-28 873-952 not yet reported which blocks → Fibernetics Corporation 464D Buckingham —
2023-02-28 873-953 not yet reported which blocks → Fibernetics Corporation 464D Gatineau —
2023-02-28 873-954 not yet reported which blocks → Fibernetics Corporation 464D St-Pierre-de-Wakefield —
2023-02-28 915-339 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J EL PASO TX
2023-02-28 940-582 1XXX which blocks → COMCAST IP PHONE, LLC 318J WICHITAFLS TX
2023-02-28 945-290 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GRANDPRARI TX
2023-02-28 954-853 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 FTLAUDERDL FL
2023-02-28 980-420 0–9 XXXall 10 · 3 holders which blocks → HADLO TECHNOLOGIES, LLC 436J CHARLOTTE NC
2023-02-28 984-326 0–9 XXXall 10 · 3 holders which blocks → HADLO TECHNOLOGIES, LLC 436J RALEIGH NC
2023-02-28 986-641 1XXX which blocks → MIDVALE TELEPHONE EXCHANGE, INC. 2226 YELLOWPINE ID
2023-02-27 240-984 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 NEW MARKET MD
2023-02-27 252-403 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J GREENVILLE NC
2023-02-27 350-206 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 TURLOCK CA
2023-02-27 365-912 not yet reported which blocks → Bell Mobility 6574 Hamilton —
2023-02-27 404-690 0–9 XXXall 10 · 3 holders which blocks → HADLO TECHNOLOGIES, LLC 436J ATLANTA GA
2023-02-27 437-433 not yet reported which blocks → Bell Mobility 6574 Toronto —
2023-02-27 472-214 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 LAURINBURG NC
2023-02-27 472-215 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J FAYETTEVL NC
2023-02-27 603-720 1XXX which blocks → TWC IP ENABLED SERVICES, LLC 793K TROY NH
2023-02-27 606-413 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CORBIN KY
2023-02-27 828-673 0XXX1XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J ASHEVILLE NC
2023-02-24 505-548 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J ALBUQURQUE NM
2023-02-24 574-396 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → AT&T - LOCAL 7421 OSCEOLA IN
2023-02-24 585-661 6XXX which blocks → TC SYSTEMS, INC. - NY 7140 OAKFIELD NY
2023-02-24 656-214 0–9 XXXall 10 · 2 holders which blocks → LEAP TELECOM, LLC 616J TAMPACEN FL
2023-02-24 659-265 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - AL 072F BESSEMER AL
2023-02-24 689-303 0–9 XXXall 10 · 5 holders which blocks → LEAP TELECOM, LLC 616J ORLANDO FL
2023-02-24 742-746 not yet reported which blocks → Fibernetics Corporation 464D Oshawa —
2023-02-24 742-747 not yet reported which blocks → Fibernetics Corporation 464D South Pickering —
2023-02-24 742-748 not yet reported which blocks → Fibernetics Corporation 464D Whitby —
2023-02-24 864-817 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 LAURENS SC
2023-02-23 346-618 0–9 XXXwhole prefix which blocks → COMCAST IP PHONE, LLC 318J HOUSTON TX
2023-02-23 580-503 0XXX1XXX3XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J FLETCHER OK
2023-02-23 742-745 not yet reported which blocks → Fibernetics Corporation 464D Ajax-Pickering —
2023-02-23 873-309 not yet reported which blocks → Cooptel 818D Tingwick —
2023-02-23 951-624 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ARLINGTON CA
2023-02-22 236-312 not yet reported which blocks → Iristel Inc. 154E Vancouver —
2023-02-22 240-977 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D WSHNGTNZN6 MD
2023-02-22 326-209 0–9 XXXall 10 · 3 holders which blocks → AT&T - LOCAL 7421 NEWCARLISL OH

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.