NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

2 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 586
NEW CINGULAR WIRELESS PCS, LLC - IL 1
INTRADO COMMUNICATIONS, 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
2021-01-07 586-544-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C UTICA MI
2021-01-06 586-278-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTERLINE MI
2021-01-06 586-278-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTERLINE MI
2021-01-04 586-271-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C NEW HAVEN MI
2021-01-04 586-271-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C NEW HAVEN MI
2020-12-31 586-400-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C ROMEO MI
2020-12-31 586-400-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C ROMEO MI
2020-12-31 586-400-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C ROMEO MI
2020-12-21 586-270-2XXX 2000–2999Assigned TERRA NOVA TELECOM INC. 145J NEW HAVEN MI
2020-12-08 586-261-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C CENTERLINE MI
2020-12-08 586-283-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C WARREN MI
2020-12-08 586-303-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C WARREN MI
2020-12-08 586-600-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C CENTERLINE MI
2020-12-08 586-600-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C CENTERLINE MI
2020-12-08 586-619-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C CENTERLINE MI
2020-12-02 586-298-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2020-11-18 586-271-8XXX 8000–8999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G NEW HAVEN MI
2020-11-18 586-300-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G MT CLEMENS MI
2020-11-18 586-303-4XXX 4000–4999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G WARREN MI
2020-11-18 586-400-3XXX 3000–3999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G ROMEO MI
2020-11-18 586-500-1XXX 1000–1999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G NEWBALTIMR MI
2020-11-18 586-525-3XXX 3000–3999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G ARMADA MI
2020-11-18 586-619-4XXX 4000–4999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G CENTERLINE MI
2020-11-18 586-636-9XXX 9000–9999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G RICHMOND MI
2020-11-18 586-737-3XXX 3000–3999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G UTICA MI
2020-11-18 586-786-3XXX 3000–3999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G WASHINGTON MI
2020-11-18 586-800-7XXX 7000–7999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G ROSEVILLE MI
2020-11-05 586-816-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WASHINGTON MI
2020-11-05 586-992-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WASHINGTON MI
2020-11-04 586-300-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C MT CLEMENS MI
2020-11-04 586-300-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C MT CLEMENS MI
2020-11-04 586-300-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C MT CLEMENS MI
2020-11-04 586-300-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C MT CLEMENS MI
2020-11-04 586-300-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C MT CLEMENS MI
2020-11-04 586-327-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C ROSEVILLE MI
2020-11-04 586-327-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C ROSEVILLE MI
2020-11-04 586-327-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C ROSEVILLE MI
2020-11-04 586-327-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C ROSEVILLE MI
2020-10-21 586-365-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C WARREN MI
2020-10-21 586-365-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C WARREN MI
2020-10-21 586-737-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C UTICA MI
2020-10-21 586-737-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C UTICA MI
2020-10-19 586-300-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2020-10-19 586-300-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2020-08-13 586-290-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C RICHMOND MI
2020-08-13 586-290-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C RICHMOND MI
2020-08-13 586-525-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C ARMADA MI
2020-08-13 586-525-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C ARMADA MI
2020-07-28 586-788-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E UTICA MI
2020-07-23 586-786-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WASHINGTON 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.