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 509
CENTURYLINK COMMUNICATIONS, LLC 92
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
2023-04-25 509-746-1XXX 1000–1999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J YAKIMA WA
2023-04-25 509-746-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J YAKIMA WA
2023-04-25 509-746-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J YAKIMA WA
2023-04-25 509-746-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J YAKIMA WA
2023-04-25 509-746-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J YAKIMA WA
2021-10-01 509-603-0XXX 0000–0999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2021-10-01 509-603-1XXX 1000–1999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2021-10-01 509-603-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2021-10-01 509-603-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2021-10-01 509-603-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2021-10-01 509-603-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2021-10-01 509-603-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2021-10-01 509-603-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2021-10-01 509-603-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2021-10-01 509-603-9XXX 9000–9999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2021-03-22 509-403-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J QUINCY WA
2021-03-22 509-403-9XXX 9000–9999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J QUINCY WA
2019-10-28 509-503-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2018-11-06 509-530-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2018-11-06 509-530-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2018-11-06 509-530-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2018-11-06 509-530-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2018-11-06 509-530-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2018-09-14 509-866-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2017-09-26 509-284-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TEKOA WA
2016-04-28 509-580-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SELAH WA
2015-10-30 509-620-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COULEE DAM WA
2015-01-15 509-404-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DAYTON WA
2015-01-07 509-349-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WARDEN WA
2015-01-07 509-717-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J EPHRATA WA
2015-01-07 509-761-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MOSES LAKE WA
2015-01-06 509-913-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OTHELLO WA
2014-12-26 509-345-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WILSON CRK WA
2014-12-26 509-390-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SOAP LAKE WA
2014-12-26 509-414-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ELK-GRNBLF WA
2014-12-26 509-497-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BENTONCITY WA
2014-12-26 509-553-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COLFAX WA
2014-12-26 509-565-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MEDICAL LK WA
2014-12-26 509-566-1XXX 1000–1999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J POMEROY WA
2014-12-26 509-578-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RICHLAND WA
2014-12-26 509-584-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WAPATO WA
2014-12-26 509-587-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BREWSTER WA
2014-12-26 509-632-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COULEECITY WA
2014-12-26 509-634-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J NESPELEM WA
2014-12-26 509-659-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RITZVILLE WA
2014-12-26 509-677-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LIND WA
2014-12-26 509-686-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BRIDGEPORT WA
2014-12-26 509-722-1XXX 1000–1999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CHEWELAH WA
2014-12-26 509-738-0XXX 0000–0999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J KETTLE FLS WA
2014-12-26 509-745-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DOUGLASCO 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.