NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

9 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 872
NEW CINGULAR WIRELESS PCS, LLC - IL 8
8X8, INC. 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
2021-10-08 872-287-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2021-10-08 872-287-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2021-10-08 872-287-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2021-10-08 872-287-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2021-10-07 872-289-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2021-10-07 872-289-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2021-10-07 872-289-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2021-10-07 872-289-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2021-10-07 872-289-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2021-09-30 872-288-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2021-09-30 872-288-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2021-09-30 872-288-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2021-09-30 872-288-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2021-09-30 872-899-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2021-09-29 872-285-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2021-09-29 872-285-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2021-09-29 872-288-0XXX 0000–0999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2021-09-29 872-290-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2021-09-29 872-290-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2021-09-29 872-290-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2021-09-29 872-290-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2021-09-29 872-290-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2021-09-29 872-290-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2021-09-29 872-291-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2021-09-29 872-292-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2021-09-29 872-292-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2021-09-29 872-292-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2021-09-29 872-292-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2021-09-29 872-292-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2021-09-29 872-292-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2021-09-29 872-766-9XXX 9000–9999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2021-09-27 872-290-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN10 IL
2021-09-27 872-290-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN10 IL
2021-09-27 872-290-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN10 IL
2021-09-27 872-290-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN10 IL
2021-09-24 872-286-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN09 IL
2021-09-24 872-286-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN09 IL
2021-09-24 872-286-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN09 IL
2021-09-24 872-286-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN09 IL
2021-09-24 872-286-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN09 IL
2021-09-15 872-899-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2021-09-10 872-288-8XXX 8000–8999Assigned SKYE TELECOM LLC DBA SKYETEL 622J CHICGOZN01 IL
2021-09-07 872-275-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2021-09-07 872-279-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2021-09-07 872-279-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2021-09-07 872-279-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2021-09-07 872-279-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2021-09-07 872-279-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2021-09-07 872-664-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2021-09-07 872-664-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL

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.