NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

360 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - IL 26
Rogers Communications Canada Inc. (Wireless) 23
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
2021-06-17 657-503 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ANAHEIM CA
2021-06-17 657-504 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2021-06-17 657-506 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2021-06-17 657-507 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2021-06-17 657-587 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H SILVERADO CA
2021-06-17 667-361 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H CHURCHHILL MD
2021-06-17 667-467 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H DENTON MD
2021-06-17 667-665 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H HILLSBORO MD
2021-06-17 667-669 2XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H GALENA MD
2021-06-17 667-775 1XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H MILLINGTON MD
2021-06-17 726-207 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 SANANTONIO TX
2021-06-17 742-300 not yet reported which blocks → IXICA Communications Inc. 812H Streetsville —
2021-06-17 742-333 not yet reported which blocks → IXICA Communications Inc. 812H Oshawa —
2021-06-17 742-400 not yet reported which blocks → IXICA Communications Inc. 812H Ajax-Pickering —
2021-06-17 742-444 not yet reported which blocks → IXICA Communications Inc. 812H Hamilton —
2021-06-17 742-500 not yet reported which blocks → IXICA Communications Inc. 812H Niagara Falls —
2021-06-17 742-600 not yet reported which blocks → IXICA Communications Inc. 812H Whitby —
2021-06-17 816-375 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MO 093F GREENWOOD MO
2021-06-17 838-252 0XXX1XXX2XXX5XXX · 2 holders which blocks → ONVOY, LLC- NY 384C PALENVILLE NY
2021-06-17 838-253 0XXX3XXX5XXX · 2 holders which blocks → ONVOY, LLC- NY 384C PAULSMITHS NY
2021-06-17 838-254 0XXX4XXX5XXX9XXX · 2 holders which blocks → ONVOY, LLC- NY 384C SARANAC NY
2021-06-17 930-243 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - IN 105F BEDFORD IN
2021-06-17 971-398 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SALEM OR
2021-06-17 984-280 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NC 6324 BENSON NC
2021-06-16 308-356 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BARTLETT NE
2021-06-16 308-410 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BRADY NE
2021-06-16 308-412 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EUSTIS NE
2021-06-16 308-413 0XXX7XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 THEDFORD NE
2021-06-16 308-416 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CURTIS NE
2021-06-16 308-431 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FARNAM NE
2021-06-16 308-435 1XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MERNA NE
2021-06-16 308-441 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NO BURWELL NE
2021-06-16 308-442 1XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MAYWOOD NE
2021-06-16 308-454 5XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MAXWELL NE
2021-06-16 308-481 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOLBROOK NE
2021-06-16 308-491 0XXX1XXX4XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GRANT NE
2021-06-16 308-495 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HERSHEY NE
2021-06-16 308-509 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MADRID NE
2021-06-16 308-554 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GIBBON NE
2021-06-16 308-599 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITCHFIELD NE
2021-06-16 313-514 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C DETROITZN4 MI
2021-06-16 431-867 not yet reported which blocks → Westman Media Cooperative Ltd 120F Crystal City —
2021-06-16 431-868 not yet reported which blocks → Westman Media Cooperative Ltd 120F Pilot Mound —
2021-06-16 506-231 not yet reported which blocks → Bell Mobility Aliant 329A Saint John —
2021-06-16 506-842 not yet reported which blocks → Bell Mobility Aliant 329A Saint John —
2021-06-16 586-284 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C WASHINGTON MI
2021-06-16 657-528 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2021-06-16 734-563 0XXX1XXX3XXX4XXX5XXX7XXX · 3 holders which blocks → ONVOY, LLCV - MI 543C PINCKNEY MI
2021-06-16 810-273 0XXX1XXX2XXX3XXX4XXX5XXX7XXX · 4 holders which blocks → ONVOY, LLCV - MI 543C GOODRICH MI
2021-06-16 810-283 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → ONVOY, LLCV - MI 543C JEDDO MI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.