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 231
BANDWIDTH.COM CLEC, LLC - MI 143
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
2026-06-11 231-428-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MUSKEGON MI
2026-04-01 231-203-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ALANSON MI
2025-12-17 231-341-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E LAKE ANN MI
2025-12-17 231-545-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E BOYNEFALLS MI
2025-11-12 231-304-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E BRUTUS MI
2025-11-12 231-626-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E LEVERING MI
2022-09-29 231-834-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E GRANT MI
2022-08-24 231-974-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E GRANT MI
2022-03-10 231-391-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WALLOON LK MI
2022-02-01 231-396-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CADILLAC MI
2022-02-01 231-396-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CADILLAC MI
2022-02-01 231-422-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E PELLSTON MI
2021-11-15 231-936-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E SCOTTVILLE MI
2021-11-09 231-364-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E NORTHPORT MI
2021-09-16 231-968-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CADILLAC MI
2021-09-16 231-968-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CADILLAC MI
2021-09-03 231-320-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E TRCHRIVBDG MI
2021-09-03 231-371-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E TUSTIN MI
2021-08-26 231-379-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E ONEKAMA MI
2021-08-19 231-475-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MANTON MI
2021-08-17 231-280-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MANCELONA MI
2021-08-12 231-977-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MACKINAWCY MI
2021-08-09 231-442-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HARRIETTA MI
2021-08-05 231-464-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E FREESOIL MI
2021-08-03 231-385-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CORAL MI
2021-07-27 231-431-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CLAM RIVER MI
2021-07-22 231-999-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CENTRAL LK MI
2021-07-20 231-495-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E BELLAIRE MI
2020-12-07 231-447-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOLTON MI
2020-11-18 231-333-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CHEBOYGAN MI
2020-11-18 231-333-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CHEBOYGAN MI
2020-08-25 231-879-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E FIFE LAKE MI
2020-03-20 231-636-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HOWARDCITY MI
2020-03-18 231-875-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E FRUITPORT MI
2020-01-09 231-244-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E BOYNE CITY MI
2019-11-19 231-202-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MECOSTA MI
2019-08-06 231-259-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E SHELBY MI
2019-05-29 231-900-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MUSKEGON MI
2019-05-14 231-221-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E HARBOR SPG MI
2019-05-10 231-253-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CADILLAC MI
2019-05-09 231-515-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E EVART MI
2019-04-24 231-598-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E BIG RAPIDS MI
2019-04-23 231-685-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E RAVENNA MI
2019-04-23 231-888-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E TWIN LAKE MI
2018-10-01 231-247-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E WILLIAMSBG MI
2018-09-26 231-216-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E FRANKFORT MI
2018-09-26 231-564-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E KALKASKA MI
2018-08-08 231-246-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E MUSKEGON MI
2018-07-31 231-480-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E LUDINGTON MI
2018-07-20 231-289-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E CHARLEVOIX 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.