NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

338 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2023-03-27 557-202 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J ST LOUIS MO
2023-03-27 567-410 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J MANSFIELD OH
2023-03-27 573-905 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J JEFFERSNCY MO
2023-03-27 683-707 not yet reported which blocks → ISP Telecom Inc. 4727 Pefferlaw —
2023-03-27 683-929 not yet reported which blocks → ISP Telecom Inc. 4727 Udora —
2023-03-27 753-478 not yet reported which blocks → ISP Telecom Inc. 4727 Avonmore —
2023-03-27 753-669 not yet reported which blocks → ISP Telecom Inc. 4727 Finch —
2023-03-27 753-901 not yet reported which blocks → ISP Telecom Inc. 4727 Glen Robertson —
2023-03-27 804-813 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 DAWN VA
2023-03-27 826-219 0XXX which blocks → ONVOY SPECTRUM, LLC 624H MCGAHEYSVL VA
2023-03-27 826-540 0XXX which blocks → ONVOY SPECTRUM, LLC 624H HINTON VA
2023-03-27 979-403 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBUS TX
2023-03-24 228-240 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J GULFPORT MS
2023-03-24 251-429 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J GRAND BAY AL
2023-03-24 256-994 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AL 5255 DECATUR AL
2023-03-24 260-601 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - IN 097D FORT WAYNE IN
2023-03-24 424-487 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNMN SNMN CA
2023-03-24 468-590 not yet reported which blocks → ISP Telecom Inc. 4727 St-Faustin —
2023-03-24 468-822 not yet reported which blocks → ISP Telecom Inc. 4727 Val David —
2023-03-24 657-669 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ORANGE CA
2023-03-24 771-324 0–9 XXXwhole prefix which blocks → ONVOY, LLC - DC 850D WSHNGTNZN1 DC
2023-03-24 771-325 0–9 XXXwhole prefix which blocks → ONVOY, LLC - DC 850D WSHNGTNZN1 DC
2023-03-24 771-326 0–9 XXXwhole prefix which blocks → ONVOY, LLC - DC 850D WSHNGTNZN1 DC
2023-03-24 771-327 0–9 XXXwhole prefix which blocks → ONVOY, LLC - DC 850D WSHNGTNZN1 DC
2023-03-24 771-328 0–9 XXXwhole prefix which blocks → ONVOY, LLC - DC 850D WSHNGTNZN1 DC
2023-03-24 845-937 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 FALLSBURG NY
2023-03-24 870-452 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J EL DORADO AR
2023-03-23 229-587 0XXX8XXX · 2 holders which blocks → PLANT TELENET, INC. - GA 841E LEESBURG GA
2023-03-23 279-737 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → ONVOY, LLC - CA 649C RSVL CTHT CA
2023-03-23 367-675 not yet reported which blocks → ISP Telecom Inc. 4727 Anse-St-Jean —
2023-03-23 367-987 not yet reported which blocks → ISP Telecom Inc. 4727 Jonquiere —
2023-03-23 468-327 not yet reported which blocks → ISP Telecom Inc. 4727 Nominingue —
2023-03-23 468-476 not yet reported which blocks → ISP Telecom Inc. 4727 St-Adolphe-D'Howard —
2023-03-23 470-982 0–9 XXXall 10 · 5 holders which blocks → ETC COMMUNICATIONS, L.L.C. - GA 205D CARTERSVL GA
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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.