NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 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, all time — NPA 517
ONVOY SPECTRUM, LLC 116
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
2024-09-30 517-436-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H SAND CREEK MI
2024-09-30 517-510-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H CLAYTON MI
2024-09-30 517-837-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H TECUMSEH MI
2024-05-07 517-583-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H TEKONSHA MI
2024-05-07 517-756-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H UNION CITY MI
2024-05-07 517-774-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H COLDWTR LK MI
2024-05-07 517-858-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H BRONSON MI
2024-05-07 517-939-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H QUINCY MI
2024-04-19 517-359-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H STOCKBDG MI
2024-04-19 517-695-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H RANSOM MI
2024-04-10 517-297-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H HILLSDALE MI
2024-04-10 517-370-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H MONTGOMERY MI
2024-04-10 517-594-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H OSSEO MI
2024-04-10 517-696-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H PRATTVILLE MI
2024-04-10 517-698-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H NORTHADAMS MI
2024-04-03 517-399-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H EATON RPD MI
2024-04-03 517-890-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H HANOVER MI
2024-04-03 517-891-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H FRONTIER MI
2024-04-03 517-895-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H CONCORD MI
2024-04-03 517-991-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H CAMDEN MI
2024-03-27 517-733-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H ADDISON MI
2024-03-27 517-900-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H BUNDY HILL MI
2024-03-27 517-932-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H ALLEN MI
2024-03-27 517-938-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H BROOKLYN MI
2024-03-27 517-946-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H CAMBRIA MI
2021-12-20 517-274-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H SHAFTSBURG MI
2021-12-20 517-274-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H SHAFTSBURG MI
2021-12-20 517-633-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H ADRIAN MI
2021-12-20 517-633-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H ADRIAN MI
2021-12-17 517-247-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H JACKSON MI
2021-12-17 517-462-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H COLDWATER MI
2021-12-17 517-736-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H COLDWATER MI
2021-12-17 517-781-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H COLDWATER MI
2021-12-17 517-781-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H COLDWATER MI
2021-12-17 517-800-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H JACKSON MI
2021-12-17 517-800-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H JACKSON MI
2021-12-17 517-800-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H JACKSON MI
2021-12-15 517-400-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-12-15 517-400-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-12-15 517-744-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-12-15 517-744-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-12-15 517-744-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-12-15 517-744-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H LANSING MI
2021-11-12 517-516-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H ONSTED MI
2021-11-05 517-239-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H DE WITT MI
2021-11-05 517-239-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H DE WITT MI
2021-11-05 517-261-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H GRANDLEDGE MI
2021-11-05 517-261-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H GRANDLEDGE MI
2021-10-29 517-271-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H NASHVILLE MI
2021-10-29 517-271-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H NASHVILLE 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.