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
2023-03-23 551-364 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 BAYONNE NJ
2023-03-23 585-668 0XXX1XXX2XXX6XXX9XXX · 4 holders which blocks → NUSO, LLC 732J FAIRPORT NY
2023-03-23 607-420 1XXX2XXX which blocks → NUSO, LLC 732J BINGHAMTON NY
2023-03-23 680-260 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → NUSO, LLC 732J UTICA NY
2023-03-23 719-747 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PEYTON CO
2023-03-23 740-514 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 NEWLXINGTN OH
2023-03-23 775-509 9XXX which blocks → BOOST SUBSCRIBERCO L.L.C. 490J RED ROCK NV
2023-03-23 838-267 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J ALBANY NY
2023-03-23 845-936 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 CARMEL NY
2023-03-23 929-668 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J NWYRCYZN05 NY
2023-03-23 984-330 0–9 XXXall 10 · 2 holders which blocks → SUNCOM DBA T-MOBILE USA 8645 APEX NC
2023-03-22 279-297 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C ELK GROVE CA
2023-03-22 365-284 not yet reported which blocks → ISP Telecom Inc. 4727 Palgrave —
2023-03-22 365-528 not yet reported which blocks → ISP Telecom Inc. 4727 Schomberg —
2023-03-22 367-219 not yet reported which blocks → ISP Telecom Inc. 4727 La Baie (Chicoutimi Co.) —
2023-03-22 448-225 0XXX1XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J CHERRYLAKE FL
2023-03-22 681-463 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 732J BECKLEY WV
2023-03-22 683-850 not yet reported which blocks → ISP Telecom Inc. 4727 Bethany —
2023-03-22 814-988 6XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - PA 7315 BROCKWAY PA
2023-03-22 863-340 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H LAKELAND FL
2023-03-22 943-218 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - GA 8392 ATLANTA NE GA
2023-03-21 213-656 0–9 XXXall 10 · 3 holders which blocks → FIVE9, INC. 598J LSAN DA 01 CA
2023-03-21 251-334 0XXX2XXX3XXX4XXX which blocks → ONVOY, LLC - AL 604E URIAH AL
2023-03-21 332-273 0–9 XXXall 10 · 3 holders which blocks → FIVE9, INC. 598J NWYRCYZN01 NY
2023-03-21 404-703 0–9 XXXall 10 · 2 holders which blocks → FIVE9, INC. 598J ATLANTA GA
2023-03-21 548-289 not yet reported which blocks → ISP Telecom Inc. 4727 Bothwell —
2023-03-21 548-326 not yet reported which blocks → ISP Telecom Inc. 4727 Dresden —
2023-03-21 548-507 not yet reported which blocks → ISP Telecom Inc. 4727 Highgate —
2023-03-21 681-462 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WV 6394 RIPLEY WV
2023-03-21 683-205 not yet reported which blocks → ISP Telecom Inc. 4727 Apsley —
2023-03-21 683-412 not yet reported which blocks → ISP Telecom Inc. 4727 Bailieboro —
2023-03-21 726-239 0–9 XXXall 10 · 3 holders which blocks → FIVE9, INC. 598J SANANTONIO TX
2023-03-21 845-929 0XXX1XXX6XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J WARWICK NY
2023-03-21 906-260 1XXX2XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J RUDYARD MI
2023-03-20 276-294 0XXX1XXX2XXX · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K SPENCER VA
2023-03-20 365-418 not yet reported which blocks → Bell Canada 8051 Maple —
2023-03-20 367-330 not yet reported which blocks → Bell Mobility 6574 Quebec —
2023-03-20 423-940 0XXX8XXX9XXX · 2 holders which blocks → COMMIO, LLC 939H DAYTON TN
2023-03-20 434-330 0XXX1XXX3XXX · 2 holders which blocks → COMMIO, LLC 939H FORK UNION VA
2023-03-20 448-224 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → NUSO, LLC 732J JAY FL
2023-03-20 513-962 0–9 XXXall 10 · 5 holders which blocks → AT&T - LOCAL 7421 NEWTONSVL OH
2023-03-20 850-448 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF FLORIDA, LLC - FL 902E TALLAHASSE FL
2023-03-20 858-424 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C EL CAJON CA
2023-03-17 434-440 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMMIO, LLC 939H SO BOSTON VA
2023-03-17 458-299 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J MEDFORD OR
2023-03-17 479-505 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROGERS AR
2023-03-17 509-360 0–9 XXXall 10 · 5 holders which blocks → ZIPLY FIBER NORTHWEST LLC DBA ZIPLY FIBER 427K WALLAWALLA WA
2023-03-17 564-231 2XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J SOUTH BEND WA
2023-03-17 572-216 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHANDLER OK
2023-03-17 769-302 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA MS - LLC 458C VICKSBURG MS

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.