NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

5 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 605
NEW CINGULAR WIRELESS PCS, LLC - IL 3
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 1
AHOI LLC 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
2010-08-06 605-414-1XXX 1000–1999Assigned MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F CASTLEWOOD SD
2010-08-06 605-686-1XXX 1000–1999Assigned MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F ESTELLINE SD
2010-08-06 605-710-1XXX 1000–1999Assigned MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F LAKENORDEN SD
2010-08-06 605-792-1XXX 1000–1999Assigned MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F HAYTI SD
2010-08-06 605-922-1XXX 1000–1999Assigned MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F ELKTON SD
2010-07-20 605-597-9XXX 9000–9999Assigned QWEST CORPORATION 9631 MITCHELL SD
2010-07-13 605-534-6XXX 6000–6999Assigned MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F FLANDREAU SD
2010-07-13 605-627-3XXX 3000–3999Assigned MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F VOLGA SD
2010-07-13 605-789-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SIOUX FLS SD
2010-07-13 605-854-6XXX 6000–6999Assigned MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F DE SMET SD
2010-07-13 605-858-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RAPID CITY SD
2010-07-13 605-983-0XXX 0000–0999Assigned MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F ARLINGTON SD
2010-07-13 605-997-8XXX 8000–8999Assigned MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F FLANDREAU SD
2010-07-12 605-592-9XXX 9000–9999Assigned MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F BROOKINGS SD
2010-06-28 605-632-1XXX 1000–1999Assigned MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F LK PRESTON SD
2010-06-16 605-496-7XXX 7000–7999Assigned ONVOY, LLC - SD 162G SIOUX FLS SD
2010-06-16 605-836-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CANTON SD
2010-06-01 605-569-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 BELLEFORCH SD
2010-06-01 605-838-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 SIOUX FLS SD
2010-06-01 605-939-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 RAPID CITY SD
2010-06-01 605-939-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 RAPID CITY SD
2010-06-01 605-939-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 RAPID CITY SD
2010-06-01 605-939-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 RAPID CITY SD
2010-06-01 605-951-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 SIOUX FLS SD
2010-06-01 605-951-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 SIOUX FLS SD
2010-06-01 605-951-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 SIOUX FLS SD
2010-06-01 605-951-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 SIOUX FLS SD
2010-05-21 605-412-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F HURON SD
2010-05-21 605-653-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F YANKTON SD
2010-05-20 605-215-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F SIOUX FLS SD
2010-05-20 605-215-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F SIOUX FLS SD
2010-03-31 605-221-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F SIOUX FLS SD
2010-03-22 605-923-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F RAPID CITY SD
2010-02-19 605-496-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 SIOUX FLS SD
2010-02-19 605-496-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 SIOUX FLS SD
2010-02-19 605-496-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 SIOUX FLS SD
2010-02-19 605-786-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 RAPID CITY SD
2010-02-17 605-549-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F SPEARFISH SD
2010-01-21 605-223-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F PIERRE SD
2010-01-21 605-229-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F ABERDEEN SD
2010-01-21 605-299-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F MITCHELL SD
2010-01-21 605-956-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F WATERTOWN SD
2010-01-04 605-592-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BROOKINGS SD
2009-12-22 605-215-9XXX 9000–9999Assigned AERIAL COMMUNICATIONS, INC. 6701 SIOUX FLS SD
2009-11-18 605-939-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 RAPID CITY SD
2009-10-12 605-988-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SIOUX FLS SD
2009-09-25 605-496-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 SIOUX FLS SD
2009-09-25 605-496-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 SIOUX FLS SD
2009-09-25 605-496-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 SIOUX FLS SD
2009-09-25 605-787-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 RAPID CITY 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.