NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

10 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 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
2022-10-28 517-399-0XXX 0000–0999Assigned COMMIO, LLC 939H EATON RPD MI
2022-10-28 517-686-0XXX 0000–0999Assigned COMMIO, LLC 939H ALBION MI
2022-10-20 517-302-5XXX 5000–5999Assigned COMMIO, LLC 939H FOWLERVL MI
2022-10-07 517-726-9XXX 9000–9999Assigned COMMIO, LLC 939H VERMONTVL MI
2022-10-07 517-928-9XXX 9000–9999Assigned COMMIO, LLC 939H MASON MI
2022-10-01 517-633-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ADRIAN MI
2022-09-08 517-268-9XXX 9000–9999Assigned TERRA NOVA TELECOM INC. 145J HOLT MI
2022-09-01 517-328-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2022-08-30 517-344-1XXX 1000–1999Assigned COMMIO, LLC 939H JACKSON MI
2022-08-30 517-786-9XXX 9000–9999Assigned COMMIO, LLC 939H CHARLOTTE MI
2022-08-23 517-344-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
2022-08-23 517-378-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J POTTERVL MI
2022-08-23 517-786-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CHARLOTTE MI
2022-08-12 517-928-8XXX 8000–8999Assigned METROPCS, INC. 5562 MASON MI
2022-08-05 517-216-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LANSING MI
2022-08-05 517-216-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LANSING MI
2022-08-05 517-662-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ADRIAN MI
2022-08-02 517-692-1XXX 1000–1999Assigned BOOST SUBSCRIBERCO L.L.C. 490J SPRINGPORT MI
2022-07-22 517-893-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C LANSING MI
2022-07-22 517-893-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C LANSING MI
2022-07-22 517-893-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C LANSING MI
2022-07-22 517-893-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C LANSING MI
2022-07-22 517-893-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C LANSING MI
2022-07-14 517-302-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FOWLERVL MI
2022-07-14 517-302-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FOWLERVL MI
2022-07-13 517-261-1XXX 1000–1999Assigned METROPCS, INC. 5562 GRANDLEDGE MI
2022-06-28 517-474-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
2022-06-09 517-273-6XXX 6000–6999Assigned VONAGE AMERICA LLC 197D HOWELL MI
2022-04-20 517-302-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FOWLERVL MI
2022-04-07 517-319-4XXX 4000–4999Assigned TERRA NOVA TELECOM INC. 145J LANSING MI
2022-03-22 517-468-7XXX 7000–7999Assigned TON80 COMMUNICATIONS, LLC 516J BELL OAK MI
2022-03-22 517-686-3XXX 3000–3999Assigned TON80 COMMUNICATIONS, LLC 516J ALBION MI
2022-03-22 517-732-5XXX 5000–5999Assigned TON80 COMMUNICATIONS, LLC 516J PORTLAND MI
2022-03-22 517-842-4XXX 4000–4999Assigned TON80 COMMUNICATIONS, LLC 516J GRASS LAKE MI
2022-03-15 517-298-8XXX 8000–8999Assigned TON80 COMMUNICATIONS, LLC 516J MORENCI MI
2022-03-15 517-344-4XXX 4000–4999Assigned TON80 COMMUNICATIONS, LLC 516J JACKSON MI
2022-03-15 517-666-3XXX 3000–3999Assigned TON80 COMMUNICATIONS, LLC 516J GRANDLEDGE MI
2022-03-01 517-855-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LANSING MI
2022-02-28 517-746-8XXX 8000–8999Assigned TON80 COMMUNICATIONS, LLC 516J COLDWATER MI
2022-02-24 517-427-3XXX 3000–3999Assigned TON80 COMMUNICATIONS, LLC 516J RIVES JCT MI
2022-02-22 517-399-9XXX 9000–9999Assigned TON80 COMMUNICATIONS, LLC 516J EATON RPD MI
2022-02-22 517-426-4XXX 4000–4999Assigned TON80 COMMUNICATIONS, LLC 516J MUNITH MI
2022-02-22 517-733-3XXX 3000–3999Assigned TON80 COMMUNICATIONS, LLC 516J ADDISON MI
2022-02-16 517-436-4XXX 4000–4999Assigned TON80 COMMUNICATIONS, LLC 516J SAND CREEK MI
2022-02-16 517-774-6XXX 6000–6999Assigned TON80 COMMUNICATIONS, LLC 516J COLDWTR LK MI
2022-02-03 517-939-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E QUINCY MI
2022-02-02 517-296-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C MONTGOMERY MI
2022-01-26 517-758-0XXX 0000–0999Assigned COMMIO, LLC 939H HOLT MI
2022-01-25 517-302-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FOWLERVL MI
2022-01-11 517-837-4XXX 4000–4999Assigned TON80 COMMUNICATIONS, LLC 516J TECUMSEH 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.