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
2016-11-10 586-305-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2016-11-09 586-676-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MT CLEMENS MI
2016-10-27 586-238-3XXX 3000–3999Assigned PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G ROSEVILLE MI
2016-10-10 586-251-1XXX 1000–1999Assigned GRID 4 COMMUNICATIONS, INC. - MI 9714 UTICA MI
2016-10-10 586-267-9XXX 9000–9999Assigned GRID 4 COMMUNICATIONS, INC. - MI 9714 MT CLEMENS MI
2016-10-10 586-571-1XXX 1000–1999Assigned GRID 4 COMMUNICATIONS, INC. - MI 9714 CENTERLINE MI
2016-10-04 586-252-0XXX 0000–0999Assigned METROPCS, INC. 5562 ROSEVILLE MI
2016-10-04 586-252-1XXX 1000–1999Assigned METROPCS, INC. 5562 ROSEVILLE MI
2016-09-26 586-696-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ROSEVILLE MI
2016-09-20 586-251-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J UTICA MI
2016-08-25 586-241-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2016-08-25 586-241-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2016-08-25 586-241-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2016-08-25 586-241-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2016-08-25 586-241-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2016-08-15 586-241-6XXX 6000–6999Assigned METROPCS, INC. 5562 ROSEVILLE MI
2016-08-10 586-371-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WASHINGTON MI
2016-08-02 586-267-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C MT CLEMENS MI
2016-08-02 586-267-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2016-08-02 586-267-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2016-08-02 586-267-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2016-08-02 586-267-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2016-08-02 586-267-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2016-08-02 586-267-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2016-07-27 586-204-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C ROSEVILLE MI
2016-07-25 586-960-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ROMEO MI
2016-07-19 586-204-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ROSEVILLE MI
2016-07-08 586-625-9XXX 9000–9999Assigned METROPCS, INC. 5562 ARMADA MI
2016-07-05 586-460-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARMADA MI
2016-07-05 586-460-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARMADA MI
2016-06-27 586-241-0XXX 0000–0999Assigned METROPCS, INC. 5562 ROSEVILLE MI
2016-06-27 586-636-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C RICHMOND MI
2016-06-22 586-250-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WARREN MI
2016-06-22 586-571-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CENTERLINE MI
2016-06-21 586-204-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ROSEVILLE MI
2016-06-21 586-251-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E UTICA MI
2016-06-07 586-371-3XXX 3000–3999Assigned METROPCS, INC. 5562 WASHINGTON MI
2016-04-29 586-241-1XXX 1000–1999Assigned METROPCS, INC. 5562 ROSEVILLE MI
2016-04-27 586-371-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J WASHINGTON MI
2016-04-26 586-267-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2016-04-15 586-267-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MT CLEMENS MI
2016-04-14 586-571-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTERLINE MI
2016-04-14 586-571-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTERLINE MI
2016-04-11 586-842-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MT CLEMENS MI
2016-04-11 586-842-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MT CLEMENS MI
2016-04-11 586-842-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MT CLEMENS MI
2016-04-11 586-842-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MT CLEMENS MI
2016-04-01 586-251-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 UTICA MI
2016-04-01 586-251-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 UTICA MI
2016-04-01 586-251-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 UTICA 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.