NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

2 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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
2019-10-11 586-500-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C NEWBALTIMR MI
2019-10-11 586-500-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C NEWBALTIMR MI
2019-10-03 586-303-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
2019-10-03 586-303-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
2019-09-09 586-258-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
2019-08-21 586-800-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2019-08-09 586-788-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 UTICA MI
2019-08-05 586-250-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
2019-08-05 586-474-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
2019-07-03 586-900-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2019-06-19 586-250-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
2019-05-06 586-371-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WASHINGTON MI
2019-05-06 586-900-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MT CLEMENS MI
2019-05-06 586-900-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MT CLEMENS MI
2019-05-06 586-900-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MT CLEMENS MI
2019-05-03 586-788-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 UTICA MI
2019-04-08 586-666-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MT CLEMENS MI
2019-04-08 586-666-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MT CLEMENS MI
2019-04-08 586-666-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MT CLEMENS MI
2019-03-29 586-496-8XXX 8000–8999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L ROSEVILLE MI
2019-02-26 586-900-0XXX 0000–0999Assigned TERRA NOVA TELECOM INC. 145J MT CLEMENS MI
2019-01-23 586-290-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 RICHMOND MI
2019-01-23 586-290-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 RICHMOND MI
2019-01-21 586-271-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 NEW HAVEN MI
2019-01-17 586-636-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 RICHMOND MI
2018-12-19 586-461-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2018-12-19 586-496-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2018-12-11 586-303-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2018-11-27 586-303-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WARREN MI
2018-11-26 586-461-8XXX 8000–8999Assigned METROPCS, INC. 5562 MT CLEMENS MI
2018-10-26 586-281-5XXX 5000–5999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G ROMEO MI
2018-10-26 586-784-6XXX 6000–6999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G ARMADA MI
2018-10-23 586-627-4XXX 4000–4999Assigned METROPCS, INC. 5562 MT CLEMENS MI
2018-10-12 586-788-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 UTICA MI
2018-10-02 586-519-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CENTERLINE MI
2018-10-01 586-250-4XXX 4000–4999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G WARREN MI
2018-10-01 586-525-0XXX 0000–0999Assigned METROPCS, INC. 5562 ARMADA MI
2018-10-01 586-525-8XXX 8000–8999Assigned METROPCS, INC. 5562 ARMADA MI
2018-10-01 586-525-9XXX 9000–9999Assigned METROPCS, INC. 5562 ARMADA MI
2018-09-19 586-496-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2018-08-20 586-519-6XXX 6000–6999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G CENTERLINE MI
2018-08-17 586-371-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C WASHINGTON MI
2018-08-17 586-519-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C CENTERLINE MI
2018-08-17 586-684-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C NEWBALTIMR MI
2018-08-17 586-784-0XXX 0000–0999Assigned ONVOY, LLCV - MI 543C ARMADA MI
2018-08-07 586-250-5XXX 5000–5999Assigned ONVOY, LLCV - MI 543C WARREN MI
2018-07-09 586-422-6XXX 6000–6999Assigned METROPCS, INC. 5562 ARMADA MI
2018-07-09 586-422-7XXX 7000–7999Assigned METROPCS, INC. 5562 ARMADA MI
2018-07-09 586-422-8XXX 8000–8999Assigned METROPCS, INC. 5562 ARMADA MI
2018-06-28 586-422-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ARMADA MI

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.