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
2018-06-14 586-551-7XXX 7000–7999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G MT CLEMENS MI
2018-06-14 586-684-1XXX 1000–1999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G NEWBALTIMR MI
2018-06-05 586-785-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROMEO MI
2018-06-05 586-960-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROMEO MI
2018-06-05 586-960-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROMEO MI
2018-05-03 586-422-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ARMADA MI
2018-04-12 586-330-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E NEWBALTIMR MI
2018-03-27 586-519-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTERLINE MI
2018-03-27 586-519-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTERLINE MI
2018-03-27 586-701-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 NEW HAVEN MI
2018-03-27 586-701-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 NEW HAVEN MI
2018-03-26 586-422-5XXX 5000–5999Assigned METROPCS, INC. 5562 ARMADA MI
2018-03-13 586-636-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E RICHMOND MI
2018-03-05 586-666-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MT CLEMENS MI
2018-03-05 586-666-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MT CLEMENS MI
2018-03-05 586-666-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MT CLEMENS MI
2018-02-20 586-666-8XXX 8000–8999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L MT CLEMENS MI
2018-01-05 586-788-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C UTICA MI
2018-01-05 586-788-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C UTICA MI
2017-12-19 586-474-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C WARREN MI
2017-12-19 586-474-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C WARREN MI
2017-12-14 586-666-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C MT CLEMENS MI
2017-12-14 586-666-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C MT CLEMENS MI
2017-12-11 586-250-9XXX 9000–9999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L WARREN MI
2017-12-11 586-496-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ROSEVILLE MI
2017-12-07 586-422-4XXX 4000–4999Assigned METROPCS, INC. 5562 ARMADA MI
2017-11-29 586-788-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E UTICA MI
2017-11-06 586-800-1XXX 1000–1999Assigned ONVOY, LLCV - MI 543C ROSEVILLE MI
2017-11-06 586-800-2XXX 2000–2999Assigned ONVOY, LLCV - MI 543C ROSEVILLE MI
2017-11-06 586-800-3XXX 3000–3999Assigned ONVOY, LLCV - MI 543C ROSEVILLE MI
2017-11-06 586-800-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C ROSEVILLE MI
2017-10-25 586-696-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2017-10-25 586-696-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2017-10-25 586-696-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2017-10-25 586-888-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2017-10-10 586-696-1XXX 1000–1999Assigned METROPCS, INC. 5562 ROSEVILLE MI
2017-10-09 586-551-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2017-10-09 586-551-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2017-10-09 586-551-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2017-10-09 586-551-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2017-10-09 586-551-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2017-10-09 586-800-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C ROSEVILLE MI
2017-10-09 586-800-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C ROSEVILLE MI
2017-10-05 586-422-2XXX 2000–2999Assigned METROPCS, INC. 5562 ARMADA MI
2017-10-05 586-422-3XXX 3000–3999Assigned METROPCS, INC. 5562 ARMADA MI
2017-09-27 586-922-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2017-09-26 586-666-6XXX 6000–6999Assigned ONVOY, LLCV - MI 543C MT CLEMENS MI
2017-09-19 586-701-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E NEW HAVEN MI
2017-09-07 586-238-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROSEVILLE MI
2017-08-17 586-422-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARMADA 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.