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 605
LEVEL 3 COMMUNICATIONS, LLC - SD 73
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
2023-12-28 605-513-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 RAPID CITY SD
2022-12-28 605-620-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 LK PRESTON SD
2022-12-14 605-405-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 ARLINGTON SD
2022-12-14 605-409-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 HARISBGTEA SD
2022-12-14 605-531-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 FLANDREAU SD
2022-12-14 605-634-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 CAVOUR SD
2022-12-14 605-636-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 MADISON SD
2022-12-14 605-640-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 MCINTOSH SD
2022-12-14 605-663-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 HURON SD
2022-12-14 605-808-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 REDFIELD SD
2022-12-14 605-815-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 CHAMBERLAN SD
2022-12-14 605-827-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 VOLGA SD
2022-12-14 605-861-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 DE SMET SD
2022-12-14 605-898-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 IROQUOIS SD
2022-12-14 605-952-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 ELK POINT SD
2022-12-14 605-989-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 NOVALENTIN SD
2022-12-14 605-991-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 MILBANK SD
2022-12-14 605-992-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 BIGSTONECY SD
2022-12-14 605-998-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 MILLER SD
2022-07-07 605-601-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2022-06-01 605-501-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2022-01-25 605-675-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 VERMILLION SD
2021-12-29 605-401-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2021-07-28 605-401-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2021-05-19 605-705-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2020-11-02 605-987-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 CANTON SD
2020-10-22 605-403-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2020-10-20 605-307-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 HILL CITY SD
2020-06-11 605-846-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 ABERDEEN SD
2019-10-16 605-681-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2019-08-01 605-800-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2019-03-27 605-799-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2018-11-16 605-937-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2017-04-19 605-349-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 WESTJASPER SD
2017-01-10 605-679-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2016-10-04 605-219-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 RAPID CITY SD
2016-04-15 605-799-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2016-01-29 605-540-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 NOSIOUX CY SD
2015-07-14 605-231-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2014-09-30 605-988-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2014-09-12 605-206-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 STURGIS SD
2014-05-09 605-679-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2014-02-05 605-865-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 TIMBERLAKE SD
2013-11-15 605-591-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SPEARFISH SD
2013-11-01 605-789-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2013-09-03 605-857-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 YANKTON SD
2013-06-06 605-956-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 WATERTOWN SD
2013-04-22 605-646-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 RAPID CITY SD
2013-04-22 605-988-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2012-11-29 605-277-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 ABERDEEN SD

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.