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 585
LEVEL 3 COMMUNICATIONS, LLC - NY 162
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
2022-04-28 585-895-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2022-03-29 585-895-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2022-03-08 585-895-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2022-02-08 585-895-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2021-10-19 585-824-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 WAYLAND NY
2021-09-09 585-910-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2021-06-29 585-910-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2021-02-24 585-565-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2019-05-28 585-437-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 RUSHFORD NY
2019-05-28 585-597-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 CORFU NY
2019-05-28 585-990-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NUNDA NY
2019-02-14 585-304-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 OAKFIELD NY
2018-01-04 585-625-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2018-01-04 585-667-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 WEBSTER NY
2017-10-26 585-625-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2017-07-18 585-537-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2017-04-26 585-407-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 VICTOR NY
2016-10-11 585-736-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2015-11-19 585-629-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2015-09-29 585-326-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 AKRON NY
2015-09-04 585-357-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ALBION NY
2015-05-12 585-207-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 FILLMORE NY
2015-05-12 585-547-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 DARIEN NY
2015-05-12 585-676-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 FRANKLINVL NY
2015-05-12 585-973-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 FRIENDSHIP NY
2015-05-08 585-380-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 BLISS NY
2015-05-08 585-548-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 BYRON NY
2015-04-23 585-358-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 HENRIETTA NY
2014-09-30 585-623-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2014-09-30 585-623-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2014-09-24 585-280-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 WEBSTER NY
2014-09-03 585-229-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 HONEOYE NY
2014-09-03 585-526-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 STANLEY NY
2014-09-03 585-572-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 LIVONIA NY
2014-08-12 585-785-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2014-04-24 585-445-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2014-01-22 585-481-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2013-10-04 585-471-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2013-07-19 585-471-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2013-05-31 585-445-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2013-05-31 585-445-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2012-12-12 585-978-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2012-06-22 585-257-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 HOLCOMB NY
2012-06-22 585-299-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 CHURCHVL NY
2012-06-22 585-318-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 MEDINA NY
2012-06-22 585-386-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ANGELICA NY
2012-06-22 585-438-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 AVON NY
2012-06-22 585-497-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 HONEOYEFLS NY
2012-06-22 585-554-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 RUSHVILLE NY
2012-06-22 585-659-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 KENDALL NY

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.