NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

7 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, last 30 days — NPA 231
NEW CINGULAR WIRELESS PCS, LLC - IL 2
EXIANT COMMUNICATIONS LLC 2
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 2
AHOI LLC 1
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 thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2022-02-01 231-396-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CADILLAC MI
2022-02-01 231-396-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CADILLAC MI
2022-02-01 231-422-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E PELLSTON MI
2022-01-21 231-402-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C MUSKEGON MI
2022-01-21 231-402-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C MUSKEGON MI
2022-01-21 231-402-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C MUSKEGON MI
2022-01-21 231-402-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C MUSKEGON MI
2022-01-20 231-390-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C BIG RAPIDS MI
2022-01-20 231-390-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C BIG RAPIDS MI
2022-01-19 231-401-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H TRAVERSECY MI
2022-01-19 231-401-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H TRAVERSECY MI
2022-01-10 231-380-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 NEWAYGO MI
2022-01-10 231-380-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 NEWAYGO MI
2022-01-09 231-707-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 NEWAYGO MI
2021-12-30 231-880-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
2021-12-21 231-401-0XXX 0000–0999Assigned PENINSULA FIBER NETWORK, LLC - MI 116F TRAVERSECY MI
2021-12-15 231-475-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MANTON MI
2021-12-07 231-296-1XXX 1000–1999Assigned IP HORIZON LLC 515J FREMONT MI
2021-12-07 231-381-1XXX 1000–1999Assigned IP HORIZON LLC 515J WHITECLOUD MI
2021-12-07 231-387-8XXX 8000–8999Assigned IP HORIZON LLC 515J PETOSKEY MI
2021-12-07 231-390-0XXX 0000–0999Assigned IP HORIZON LLC 515J BIG RAPIDS MI
2021-12-07 231-396-0XXX 0000–0999Assigned IP HORIZON LLC 515J CADILLAC MI
2021-12-07 231-397-0XXX 0000–0999Assigned IP HORIZON LLC 515J MANISTEE MI
2021-12-07 231-465-9XXX 9000–9999Assigned IP HORIZON LLC 515J REED CITY MI
2021-12-07 231-600-5XXX 5000–5999Assigned IP HORIZON LLC 515J TRAVERSECY MI
2021-12-07 231-624-2XXX 2000–2999Assigned IP HORIZON LLC 515J KALKASKA MI
2021-12-07 231-974-1XXX 1000–1999Assigned IP HORIZON LLC 515J GRANT MI
2021-11-22 231-278-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H HESPERIA MI
2021-11-19 231-293-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C FRANKFORT MI
2021-11-15 231-270-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C BOYNE CITY MI
2021-11-15 231-273-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C EASTPORT MI
2021-11-15 231-936-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E SCOTTVILLE MI
2021-11-09 231-364-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E NORTHPORT MI
2021-11-03 231-297-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H KINGSLEY MI
2021-11-03 231-297-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H KINGSLEY MI
2021-11-03 231-397-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MANISTEE MI
2021-11-03 231-397-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MANISTEE MI
2021-11-03 231-397-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MANISTEE MI
2021-11-03 231-397-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MANISTEE MI
2021-11-03 231-397-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MANISTEE MI
2021-11-02 231-270-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G BOYNE CITY MI
2021-11-02 231-324-8XXX 8000–8999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G HARBOR SPG MI
2021-10-29 231-212-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H INTERLOCHN MI
2021-10-29 231-212-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H INTERLOCHN MI
2021-10-29 231-247-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H WILLIAMSBG MI
2021-10-29 231-247-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H WILLIAMSBG MI
2021-10-29 231-273-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H EASTPORT MI
2021-10-29 231-273-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H EASTPORT MI
2021-10-29 231-294-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H FIFE LAKE MI
2021-10-29 231-294-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H FIFE LAKE MI

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.