NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 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 331
BANDWIDTH.COM CLEC, LLC - IL 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
2026-09-03 331-346-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E NAPERVILLE IL
2026-08-14 331-220-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2026-08-14 331-220-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2026-05-08 331-205-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2026-04-03 331-226-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E NAPERVILLE IL
2026-04-03 331-342-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E NAPERVILLE IL
2026-04-02 331-220-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2024-10-14 331-323-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E GLEN ELLYN IL
2024-07-11 331-326-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E DOWNERSGRV IL
2024-07-11 331-326-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E DOWNERSGRV IL
2023-05-25 331-289-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E HINSDALE IL
2023-05-25 331-289-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E HINSDALE IL
2022-11-22 331-290-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2022-10-18 331-279-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ELMHURST IL
2022-10-18 331-279-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ELMHURST IL
2022-10-18 331-279-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ELMHURST IL
2022-10-18 331-426-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E LEMONT IL
2022-10-18 331-426-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E LEMONT IL
2022-10-18 331-866-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E WHEATON IL
2022-10-18 331-866-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E WHEATON IL
2022-10-18 331-866-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E WHEATON IL
2022-10-18 331-866-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E WHEATON IL
2022-10-18 331-866-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E WHEATON IL
2022-10-03 331-290-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2022-09-01 331-284-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E BARTLETT IL
2022-09-01 331-426-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E LEMONT IL
2022-08-22 331-209-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ELMHURST IL
2022-08-04 331-279-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ELMHURST IL
2022-08-04 331-279-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ELMHURST IL
2022-08-04 331-279-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ELMHURST IL
2022-07-20 331-287-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2022-07-20 331-287-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2022-07-20 331-287-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2022-07-20 331-287-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2022-07-20 331-837-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E W CHICAGO IL
2022-07-20 331-837-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E W CHICAGO IL
2022-07-19 331-758-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2021-11-19 331-272-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ST CHARLES IL
2021-11-19 331-272-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ST CHARLES IL
2021-11-04 331-268-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E SUGARGROVE IL
2021-07-27 331-272-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ST CHARLES IL
2021-07-27 331-272-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ST CHARLES IL
2018-07-25 331-235-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E ST CHARLES IL
2018-06-08 331-227-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E SUGARGROVE IL
2018-06-08 331-234-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E SUGARGROVE IL
2018-03-28 331-227-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E SUGARGROVE IL
2018-03-28 331-227-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E SUGARGROVE IL
2018-03-28 331-227-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E SUGARGROVE IL
2016-07-19 331-300-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2016-07-19 331-716-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E WHEATON IL

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.