NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

355 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
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
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
2023-05-26 862-422 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - NJ 637C SO ORANGE NJ
2023-05-26 870-745 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FORREST CY AR
2023-05-26 878-200 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SCOTTDALE PA
2023-05-26 878-209 0–9 XXXall 10 · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J ALIQUIPPA PA
2023-05-26 910-919 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J LILLINGTON NC
2023-05-26 938-205 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - AL 072F CULLMAN AL
2023-05-26 938-213 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H CULLMAN AL
2023-05-26 938-833 0XXX3XXX8XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H SKYLINE AL
2023-05-25 205-659 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 BIRMINGHAM AL
2023-05-25 256-938 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 DECATUR AL
2023-05-25 308-283 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J GRAND IS NE
2023-05-25 428-300 not yet reported which blocks → Bell Mobility Aliant 329A Woodstock —
2023-05-25 639-597 not yet reported which blocks → Bell Mobility 6574 Saskatoon —
2023-05-25 720-983 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2023-05-25 862-421 0–9 XXXwhole prefix which blocks → ONVOY, LLC - NJ 637C ROCKAWAY NJ
2023-05-25 945-328 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C GRANDPRARI TX
2023-05-25 978-200 0–9 XXXall 10 · 6 holders which blocks → FIVE9, INC. 598J LOWELL MA
2023-05-24 205-256 1XXX2XXX3XXX4XXX5XXX6XXX which blocks → ONVOY SPECTRUM, LLC 624H BERRY AL
2023-05-24 256-205 5XXX which blocks → ONVOY SPECTRUM, LLC 624H WADLEY AL
2023-05-24 307-405 1XXX which blocks → ONVOY, LLC - WY 450F WBLLFOURCH WY
2023-05-24 307-416 0XXX1XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WY 9416 PINEDALE WY
2023-05-24 307-420 0XXX1XXX2XXX3XXX4XXX · 2 holders which blocks → ONVOY, LLC - WY 450F LINGLE WY
2023-05-24 307-424 0XXX1XXX2XXX · 2 holders which blocks → ONVOY, LLC - WY 450F LAKE WY
2023-05-24 307-427 0XXX1XXX2XXX7XXX · 3 holders which blocks → ONVOY, LLC - WY 450F MAMMOTH WY
2023-05-24 307-446 1XXX5XXX · 2 holders which blocks → ONVOY, LLC - WY 450F WSPEARFISH WY
2023-05-24 346-742 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C BAMMEL TX
2023-05-24 365-390 not yet reported which blocks → Bell Mobility 6574 Ajax-Pickering —
2023-05-24 530-954 0XXX1XXX2XXX8XXX9XXX · 2 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L LIVE OAK CA
2023-05-24 551-374 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - NJ 637C DUMONT NJ
2023-05-24 573-914 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CAPEGIRARD MO
2023-05-24 579-982 not yet reported which blocks → Fibernetics Corporation 464D Sorel —
2023-05-24 615-759 0XXX3XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J KINGSTNSPG TN
2023-05-24 616-203 0XXX7XXX8XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J BELDING MI
2023-05-24 854-248 0XXX1XXX2XXX6XXX8XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J PAGELAND SC
2023-05-24 908-594 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - NJ 637C ELIZABETH NJ
2023-05-24 938-380 0XXX1XXX2XXX3XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H OHATCHEE AL
2023-05-24 938-938 0XXX1XXX2XXX8XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H CHILDERSBG AL
2023-05-23 205-205 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H BIRMINGHAM AL
2023-05-23 228-253 0–9 XXXall 10 · 3 holders which blocks → CALLWORKS CORPORATION 475J BILOXI MS
2023-05-23 256-256 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H HUNTSVILLE AL
2023-05-23 352-957 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 OCALA FL
2023-05-23 367-399 not yet reported which blocks → ISP Telecom Inc. 4727 Normandin —
2023-05-23 367-505 not yet reported which blocks → ISP Telecom Inc. 4727 Chute-des-Passes —
2023-05-23 367-828 not yet reported which blocks → ISP Telecom Inc. 4727 Desbiens —
2023-05-23 404-706 0–9 XXXall 10 · 2 holders which blocks → FIVE9, INC. 598J ATLANTA GA
2023-05-23 423-872 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TERRA NOVA TELECOM INC. 145J CHATTNOOGA TN
2023-05-23 579-981 not yet reported which blocks → Fibernetics Corporation 464D St-Eustache —
2023-05-23 629-286 0–9 XXXall 10 · 3 holders which blocks → CALLWORKS CORPORATION 475J NASHVILLE TN
2023-05-23 646-347 0–9 XXXwhole prefix which blocks → ONVOY, LLC- NY 384C NWYRCYZN01 NY
2023-05-23 769-228 0–9 XXXall 10 · 3 holders which blocks → CALLWORKS CORPORATION 475J JACKSON MS

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.