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 425
LEVEL 3 COMMUNICATIONS, LLC - WA 156
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
2024-11-01 425-461-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AMES LAKE WA
2024-11-01 425-461-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AMES LAKE WA
2024-11-01 425-461-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AMES LAKE WA
2024-09-19 425-461-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AMES LAKE WA
2024-06-06 425-461-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AMES LAKE WA
2023-04-27 425-536-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2023-02-09 425-946-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 CARNATION WA
2022-12-30 425-461-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AMES LAKE WA
2021-08-25 425-966-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SNOQUMPASS WA
2020-02-26 425-459-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2020-02-05 425-300-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2020-01-14 425-300-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2020-01-14 425-300-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2019-12-13 425-728-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 RENTON WA
2019-12-03 425-403-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2019-11-04 425-490-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 FALL CITY WA
2019-10-29 425-300-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2019-10-24 425-689-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AMES LAKE WA
2019-05-07 425-480-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HALLS LAKE WA
2018-08-22 425-410-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2018-06-15 425-363-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 NORTH BEND WA
2018-06-12 425-624-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2018-06-12 425-624-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2018-04-10 425-588-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2017-08-14 425-800-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2015-11-16 425-599-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HALLS LAKE WA
2015-11-11 425-321-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SILVERLAKE WA
2015-11-11 425-507-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ISSAQUAH WA
2015-11-11 425-979-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2015-09-17 425-595-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 EVERETT WA
2015-07-08 425-689-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AMES LAKE WA
2015-06-09 425-363-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 NORTH BEND WA
2014-05-01 425-305-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2014-04-28 425-367-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 EVERETT WA
2013-10-10 425-405-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 EVERETT WA
2013-10-10 425-954-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HALLS LAKE WA
2013-03-14 425-728-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 RENTON WA
2013-01-24 425-409-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HALLS LAKE WA
2013-01-24 425-654-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ISSAQUAH WA
2013-01-16 425-405-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 EVERETT WA
2012-12-31 425-947-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2012-02-02 425-358-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 MAPLE VLY WA
2012-01-11 425-321-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SILVERLAKE WA
2012-01-04 425-368-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BOTHELL WA
2012-01-04 425-615-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2011-12-16 425-366-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 EVERETT WA
2011-11-11 425-658-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2011-09-12 425-381-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BOTHELL WA
2011-07-11 425-312-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 EVERETT WA
2011-07-11 425-409-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HALLS LAKE WA

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.