NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 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, all time — NPA 206
LEVEL 3 COMMUNICATIONS, LLC - WA 231
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
2025-10-27 206-857-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 VASHON WA
2024-12-12 206-603-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 VASHON WA
2024-09-30 206-699-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2024-09-26 206-699-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2024-09-26 206-699-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2024-04-08 206-506-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2022-04-29 206-776-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2022-04-06 206-703-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2022-02-14 206-837-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2019-11-04 206-580-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2019-06-25 206-806-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2019-06-25 206-806-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2019-04-22 206-688-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2019-04-22 206-688-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2019-02-12 206-584-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2018-04-24 206-531-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2017-12-13 206-880-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2017-10-24 206-702-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2017-06-09 206-480-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2017-06-09 206-480-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2017-06-09 206-480-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2017-06-09 206-480-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2017-06-07 206-573-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2017-06-07 206-620-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2017-06-07 206-620-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2017-06-07 206-620-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2017-06-07 206-620-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2017-06-07 206-620-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-773-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-02-29 206-413-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2015-11-13 206-899-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BAINBDG IS WA
2015-09-28 206-960-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2015-09-17 206-800-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 RICHMNDBCH WA
2015-07-16 206-445-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2015-07-16 206-471-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2013-12-11 206-435-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2013-12-11 206-435-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2013-12-11 206-435-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2013-12-11 206-435-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2013-12-11 206-435-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA

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.