NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

10 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

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 517
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 5
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 1
LEVEL 3 COMMUNICATIONS, LLC - MI 1
INTRADO COMMUNICATIONS, LLC 1
BOOST SUBSCRIBERCO L.L.C. 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
2021-01-04 517-301-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C TECUMSEH MI
2021-01-04 517-550-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C DIMONDALE MI
2021-01-04 517-550-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C DIMONDALE MI
2021-01-04 517-550-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DIMONDALE MI
2021-01-04 517-596-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C MUNITH MI
2021-01-04 517-615-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C VERMONTVL MI
2021-01-04 517-615-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C VERMONTVL MI
2021-01-04 517-815-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C TECUMSEH MI
2021-01-04 517-877-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C LITCHFIELD MI
2021-01-04 517-877-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C LITCHFIELD MI
2021-01-04 517-877-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C LITCHFIELD MI
2020-11-19 517-237-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2020-11-04 517-219-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FOWLERVL MI
2020-11-04 517-245-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FOWLERVL MI
2020-11-04 517-247-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C JACKSON MI
2020-11-04 517-247-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C JACKSON MI
2020-11-04 517-247-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C JACKSON MI
2020-11-04 517-247-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C JACKSON MI
2020-11-04 517-858-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E BRONSON MI
2020-10-29 517-271-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C NASHVILLE MI
2020-10-29 517-271-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C NASHVILLE MI
2020-10-29 517-273-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C HOWELL MI
2020-10-29 517-273-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C HOWELL MI
2020-10-29 517-468-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C BELL OAK MI
2020-10-29 517-468-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C BELL OAK MI
2020-10-29 517-624-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C DE WITT MI
2020-10-29 517-624-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DE WITT MI
2020-10-29 517-675-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C SHAFTSBURG MI
2020-10-22 517-210-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C POTTERVL MI
2020-10-22 517-210-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C POTTERVL MI
2020-10-22 517-409-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C BLISSFIELD MI
2020-10-22 517-409-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C BLISSFIELD MI
2020-10-22 517-697-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C PERRY MI
2020-10-22 517-697-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C PERRY MI
2020-10-21 517-261-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 GRANDLEDGE MI
2020-10-21 517-428-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C FOWLERVL MI
2020-10-21 517-428-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C FOWLERVL MI
2020-10-21 517-705-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C BURLINGTON MI
2020-10-21 517-705-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C BURLINGTON MI
2020-10-16 517-666-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 GRANDLEDGE MI
2020-10-15 517-429-1XXX 1000–1999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G HUDSON MI
2020-10-09 517-996-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WILLIAMSTN MI
2020-10-08 517-329-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2020-10-08 517-329-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2020-09-11 517-985-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 STOCKBDG MI
2020-08-17 517-377-7XXX 7000–7999Assigned METROPCS, INC. 5562 LANSING MI
2020-08-13 517-429-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C HUDSON MI
2020-08-13 517-429-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C HUDSON MI
2020-08-13 517-500-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C SUNFIELD MI
2020-08-13 517-500-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C SUNFIELD MI

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.