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 509
UNITED STATES CELLULAR - WA 51
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
2025-09-12 509-706-5XXX 5000–5999Assigned UNITED STATES CELLULAR - WA 6270 KENNEWICK WA
2024-10-14 509-614-3XXX 3000–3999Assigned UNITED STATES CELLULAR - WA 6270 KENNEWICK WA
2024-10-14 509-614-4XXX 4000–4999Assigned UNITED STATES CELLULAR - WA 6270 KENNEWICK WA
2024-08-21 509-614-2XXX 2000–2999Assigned UNITED STATES CELLULAR - WA 6270 KENNEWICK WA
2022-09-30 509-746-0XXX 0000–0999Assigned UNITED STATES CELLULAR - WA 6270 YAKIMA WA
2022-07-28 509-802-4XXX 4000–4999Assigned UNITED STATES CELLULAR - WA 6270 KENNEWICK WA
2021-11-03 509-208-0XXX 0000–0999Assigned UNITED STATES CELLULAR - WA 6270 YAKIMA WA
2021-11-03 509-802-0XXX 0000–0999Assigned UNITED STATES CELLULAR - WA 6270 KENNEWICK WA
2021-10-11 509-712-1XXX 1000–1999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2021-10-05 509-712-0XXX 0000–0999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2021-07-22 509-502-7XXX 7000–7999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2020-10-05 509-502-4XXX 4000–4999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2020-10-05 509-502-5XXX 5000–5999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2020-09-01 509-502-0XXX 0000–0999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2019-09-13 509-502-1XXX 1000–1999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2019-08-09 509-400-1XXX 1000–1999Assigned UNITED STATES CELLULAR - WA 6270 MATTAWA WA
2018-07-20 509-400-0XXX 0000–0999Assigned UNITED STATES CELLULAR - WA 6270 MATTAWA WA
2018-07-19 509-391-2XXX 2000–2999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2017-10-17 509-836-7XXX 7000–7999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2017-10-17 509-902-5XXX 5000–5999Assigned UNITED STATES CELLULAR - WA 6270 YAKIMA WA
2017-08-22 509-391-3XXX 3000–3999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2017-07-27 509-515-6XXX 6000–6999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2016-11-08 509-281-2XXX 2000–2999Assigned UNITED STATES CELLULAR - WA 6270 WH SALMON WA
2016-09-13 509-932-3XXX 3000–3999Assigned UNITED STATES CELLULAR - WA 6270 MATTAWA WA
2016-07-26 509-515-4XXX 4000–4999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2016-07-19 509-643-9XXX 9000–9999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2016-03-25 509-643-8XXX 8000–8999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2016-03-16 509-832-4XXX 4000–4999Assigned UNITED STATES CELLULAR - WA 6270 PROSSER WA
2016-03-10 509-643-7XXX 7000–7999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2015-10-01 509-790-2XXX 2000–2999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2015-09-30 509-932-9XXX 9000–9999Assigned UNITED STATES CELLULAR - WA 6270 MATTAWA WA
2015-05-21 509-790-1XXX 1000–1999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2013-09-27 509-932-1XXX 1000–1999Assigned UNITED STATES CELLULAR - WA 6270 MATTAWA WA
2011-01-18 509-932-7XXX 7000–7999Assigned UNITED STATES CELLULAR - WA 6270 MATTAWA WA
2008-07-16 509-790-8XXX 8000–8999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2007-09-04 509-388-3XXX 3000–3999Assigned UNITED STATES CELLULAR - WA 6270 YAKIMA WA
2007-09-04 509-834-5XXX 5000–5999Assigned UNITED STATES CELLULAR - WA 6270 YAKIMA WA
2007-09-04 509-853-8XXX 8000–8999Assigned UNITED STATES CELLULAR - WA 6270 YAKIMA WA
2007-09-04 509-853-9XXX 9000–9999Assigned UNITED STATES CELLULAR - WA 6270 YAKIMA WA
2007-06-01 509-831-4XXX 4000–4999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2007-04-16 509-895-1XXX 1000–1999Assigned UNITED STATES CELLULAR - WA 6270 YAKIMA WA
2007-04-16 509-895-3XXX 3000–3999Assigned UNITED STATES CELLULAR - WA 6270 YAKIMA WA
2005-09-27 509-831-2XXX 2000–2999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2005-09-27 509-831-3XXX 3000–3999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2005-03-14 509-480-3XXX 3000–3999Assigned UNITED STATES CELLULAR - WA 6270 YAKIMA WA
2005-03-14 509-480-4XXX 4000–4999Assigned UNITED STATES CELLULAR - WA 6270 YAKIMA WA
2005-03-14 509-480-5XXX 5000–5999Assigned UNITED STATES CELLULAR - WA 6270 YAKIMA WA
2005-03-14 509-480-6XXX 6000–6999Assigned UNITED STATES CELLULAR - WA 6270 YAKIMA WA
2005-03-14 509-480-7XXX 7000–7999Assigned UNITED STATES CELLULAR - WA 6270 YAKIMA WA
2005-03-14 509-480-8XXX 8000–8999Assigned UNITED STATES CELLULAR - WA 6270 YAKIMA 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.