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
2016-10-27 605-636-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MADISON SD
2016-10-27 605-638-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 VERMILLION SD
2016-10-04 605-219-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 RAPID CITY SD
2016-10-04 605-656-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 MITCHELL SD
2016-09-13 605-777-7XXX 7000–7999Assigned AIRUS, INC. - SD 580H HARISBGTEA SD
2016-09-13 605-777-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 HARISBGTEA SD
2016-09-08 605-534-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FLANDREAU SD
2016-08-31 605-504-0XXX 0000–0999Assigned QWEST CORPORATION 9631 SIOUX FLS SD
2016-08-31 605-504-1XXX 1000–1999Assigned QWEST CORPORATION 9631 SIOUX FLS SD
2016-08-31 605-504-2XXX 2000–2999Assigned QWEST CORPORATION 9631 SIOUX FLS SD
2016-08-31 605-504-3XXX 3000–3999Assigned QWEST CORPORATION 9631 SIOUX FLS SD
2016-08-31 605-504-4XXX 4000–4999Assigned QWEST CORPORATION 9631 SIOUX FLS SD
2016-08-31 605-504-5XXX 5000–5999Assigned QWEST CORPORATION 9631 SIOUX FLS SD
2016-08-31 605-504-6XXX 6000–6999Assigned QWEST CORPORATION 9631 SIOUX FLS SD
2016-08-31 605-504-7XXX 7000–7999Assigned QWEST CORPORATION 9631 SIOUX FLS SD
2016-08-31 605-504-8XXX 8000–8999Assigned QWEST CORPORATION 9631 SIOUX FLS SD
2016-08-31 605-504-9XXX 9000–9999Assigned QWEST CORPORATION 9631 SIOUX FLS SD
2016-08-16 605-550-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F MITCHELL SD
2016-08-16 605-681-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F SIOUX FLS SD
2016-08-09 605-205-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ELK POINT SD
2016-08-09 605-273-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MCINTOSH SD
2016-08-09 605-468-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 REDFIELD SD
2016-08-09 605-699-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BELLEFORCH SD
2016-08-09 605-853-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MILLER SD
2016-08-09 605-854-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DE SMET SD
2016-07-25 605-578-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F SPEARFISH SD
2016-07-25 605-777-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F HARISBGTEA SD
2016-07-19 605-230-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 MOBRIDGE SD
2016-07-19 605-230-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 MOBRIDGE SD
2016-06-22 605-423-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F STURGIS SD
2016-06-17 605-863-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RAPID CITY SD
2016-06-17 605-863-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RAPID CITY SD
2016-06-15 605-301-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - SD 106F PIERRE SD
2016-05-09 605-219-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 RAPID CITY SD
2016-05-09 605-681-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 SIOUX FLS SD
2016-05-05 605-440-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 CUSTER SD
2016-04-26 605-671-8XXX 8000–8999Assigned AERIAL COMMUNICATIONS, INC. 6701 COLTON SD
2016-04-26 605-671-9XXX 9000–9999Assigned AERIAL COMMUNICATIONS, INC. 6701 COLTON SD
2016-04-26 605-953-6XXX 6000–6999Assigned AERIAL COMMUNICATIONS, INC. 6701 HARTFORD SD
2016-04-26 605-953-7XXX 7000–7999Assigned AERIAL COMMUNICATIONS, INC. 6701 HARTFORD SD
2016-04-26 605-953-8XXX 8000–8999Assigned AERIAL COMMUNICATIONS, INC. 6701 HARTFORD SD
2016-04-26 605-953-9XXX 9000–9999Assigned AERIAL COMMUNICATIONS, INC. 6701 HARTFORD SD
2016-04-26 605-963-6XXX 6000–6999Assigned AERIAL COMMUNICATIONS, INC. 6701 DELLRAPIDS SD
2016-04-26 605-963-7XXX 7000–7999Assigned AERIAL COMMUNICATIONS, INC. 6701 DELLRAPIDS SD
2016-04-26 605-963-9XXX 9000–9999Assigned AERIAL COMMUNICATIONS, INC. 6701 DELLRAPIDS SD
2016-04-15 605-799-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - SD 5180 SIOUX FLS SD
2016-03-18 605-309-7XXX 7000–7999Assigned ONVOY, LLC - SD 162G NOVALENTIN SD
2016-03-18 605-309-8XXX 8000–8999Assigned ONVOY, LLC - SD 162G NOVALENTIN SD
2016-03-07 605-620-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 LK PRESTON SD
2016-03-01 605-231-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 SIOUX FLS 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.