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 586
BANDWIDTH.COM CLEC, LLC - MI 120
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
2026-03-03 586-258-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WARREN MI
2025-05-22 586-553-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WARREN 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
2020-07-28 586-788-7XXX 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
2020-07-16 586-585-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ROSEVILLE MI
2019-05-06 586-371-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WASHINGTON MI
2018-10-02 586-519-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CENTERLINE MI
2018-06-28 586-422-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ARMADA 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
2018-03-13 586-636-6XXX 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
2017-09-19 586-701-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E NEW HAVEN MI
2017-07-20 586-519-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CENTERLINE MI
2017-07-05 586-210-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E NEWBALTIMR MI
2017-07-05 586-250-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WARREN MI
2017-05-01 586-701-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E NEW HAVEN MI
2016-08-10 586-371-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WASHINGTON 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
2016-06-22 586-250-2XXX 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
2016-04-15 586-267-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MT CLEMENS 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
2015-02-13 586-459-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CENTERLINE MI
2015-02-06 586-210-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E NEWBALTIMR MI
2015-02-06 586-315-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E NEW HAVEN MI
2015-02-06 586-434-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WARREN MI
2015-02-06 586-765-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MT CLEMENS MI
2014-08-14 586-981-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WARREN MI
2014-08-11 586-217-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ROSEVILLE MI
2014-08-11 586-574-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CENTERLINE MI
2014-08-11 586-960-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ROMEO MI
2014-08-05 586-636-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E RICHMOND MI
2014-06-27 586-221-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MT CLEMENS MI
2014-06-27 586-315-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E NEW HAVEN MI
2014-05-06 586-200-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ROSEVILLE MI
2014-03-19 586-221-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MT CLEMENS MI
2014-02-26 586-262-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E UTICA MI
2014-02-26 586-330-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E NEWBALTIMR MI
2014-02-26 586-353-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CENTERLINE 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.