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 605
CENTURYLINK COMMUNICATIONS, LLC 31
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
2023-09-06 605-902-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WATERTOWN SD
2018-05-24 605-872-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RAPID CITY SD
2017-11-09 605-930-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J VOLGA SD
2017-05-31 605-862-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BIGSTONECY SD
2017-05-24 605-960-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HURON SD
2017-05-09 605-356-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ELK POINT SD
2017-05-09 605-368-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HARISBGTEA SD
2017-05-09 605-423-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J STURGIS SD
2017-05-09 605-546-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J IROQUOIS SD
2017-05-09 605-741-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J VERMILLION SD
2017-05-09 605-857-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J YANKTON SD
2017-05-09 605-865-9XXX 9000–9999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TIMBERLAKE SD
2017-05-09 605-954-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WATERTOWN SD
2017-05-09 605-997-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FLANDREAU SD
2017-05-05 605-269-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPEARFISH SD
2017-05-05 605-302-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J REDFIELD SD
2017-05-05 605-599-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CAVOUR SD
2017-05-05 605-626-9XXX 9000–9999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ABERDEEN SD
2017-05-05 605-699-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BELLEFORCH SD
2017-05-05 605-730-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CHAMBERLAN SD
2017-05-05 605-776-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PIERRE SD
2017-05-05 605-836-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CANTON SD
2017-05-05 605-854-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DE SMET SD
2017-05-05 605-858-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RAPID CITY SD
2017-05-03 605-291-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MADISON SD
2017-05-03 605-309-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J NOVALENTIN SD
2017-05-03 605-597-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MITCHELL SD
2017-05-03 605-853-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MILLER SD
2017-05-03 605-949-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MILBANK SD
2017-03-30 605-740-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SIOUX FLS SD
2016-11-29 605-540-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J NOSIOUX CY SD

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.