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 509
LEVEL 3 COMMUNICATIONS, LLC - WA 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
2026-08-21 509-604-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 RICHLAND WA
2022-05-24 509-996-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TWISP WA
2022-05-19 509-970-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2022-04-06 509-241-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2022-03-02 509-824-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2022-02-25 509-612-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KETTLE FLS WA
2022-02-25 509-936-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 CHEWELAH WA
2021-12-01 509-580-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SELAH WA
2021-08-04 509-957-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2021-04-22 509-510-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 OTHELLO WA
2021-04-20 509-339-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PULLMAN WA
2021-04-15 509-816-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2021-03-31 509-404-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 DAYTON WA
2021-02-25 509-508-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2020-02-13 509-699-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WENATCHEE WA
2020-01-29 509-219-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 STEVENSON WA
2019-12-18 509-676-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WALLAWALLA WA
2019-12-13 509-418-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2019-12-13 509-875-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PATERSON WA
2019-07-08 509-666-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2019-06-20 509-905-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PASCO WA
2019-06-10 509-500-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ASOTIN WA
2019-01-16 509-907-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 YAKIMA WA
2018-12-31 509-530-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2018-10-02 509-715-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PULLMAN WA
2018-07-31 509-384-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ROOSEVELT WA
2018-05-15 509-866-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2017-11-28 509-862-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2017-08-10 509-558-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2016-12-07 509-498-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 CHENEY WA
2016-12-07 509-904-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2016-12-06 509-203-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 GRANDVIEW WA
2016-02-26 509-968-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ELLENSBURG WA
2016-02-09 509-417-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WARDEN WA
2016-02-04 509-345-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WILSON CRK WA
2016-02-04 509-390-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SOAP LAKE WA
2016-02-04 509-414-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ELK-GRNBLF WA
2016-02-04 509-550-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 NEWPORT WA
2016-02-04 509-600-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BRIDGEPORT WA
2016-02-04 509-620-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 COULEE DAM WA
2016-02-04 509-632-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 COULEECITY WA
2016-02-04 509-639-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ALMIRA WA
2016-02-04 509-683-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 DOUGLASCO WA
2016-02-04 509-717-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 EPHRATA WA
2016-02-04 509-794-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 QUINCY WA
2016-02-04 509-821-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 DEER PARK WA
2016-02-04 509-932-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 MATTAWA WA
2015-11-11 509-317-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 YAKIMA WA
2015-11-11 509-960-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2015-09-17 509-381-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE 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.