NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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 872
IP HORIZON LLC 36
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
2023-06-07 872-316-3XXX 3000–3999Assigned IP HORIZON LLC 515J CHICGOZN07 IL
2023-06-07 872-316-4XXX 4000–4999Assigned IP HORIZON LLC 515J CHICGOZN07 IL
2023-06-07 872-320-5XXX 5000–5999Assigned IP HORIZON LLC 515J CHICGOZN10 IL
2023-06-07 872-324-5XXX 5000–5999Assigned IP HORIZON LLC 515J CHICGOZN09 IL
2023-06-07 872-325-0XXX 0000–0999Assigned IP HORIZON LLC 515J CHICGOZN02 IL
2023-06-07 872-325-1XXX 1000–1999Assigned IP HORIZON LLC 515J CHICGOZN02 IL
2023-06-07 872-327-7XXX 7000–7999Assigned IP HORIZON LLC 515J CHICGOZN04 IL
2023-06-07 872-328-8XXX 8000–8999Assigned IP HORIZON LLC 515J CHICGOZN06 IL
2023-06-07 872-328-9XXX 9000–9999Assigned IP HORIZON LLC 515J CHICGOZN06 IL
2023-06-07 872-346-7XXX 7000–7999Assigned IP HORIZON LLC 515J CHICGOZN04 IL
2023-06-07 872-372-0XXX 0000–0999Assigned IP HORIZON LLC 515J CHICGOZN05 IL
2023-06-07 872-372-1XXX 1000–1999Assigned IP HORIZON LLC 515J CHICGOZN05 IL
2023-06-07 872-674-6XXX 6000–6999Assigned IP HORIZON LLC 515J CHICGOZN08 IL
2023-06-07 872-674-7XXX 7000–7999Assigned IP HORIZON LLC 515J CHICGOZN08 IL
2023-06-07 872-842-0XXX 0000–0999Assigned IP HORIZON LLC 515J CHICGOZN11 IL
2021-05-19 872-271-4XXX 4000–4999Assigned IP HORIZON LLC 515J CHICGOZN03 IL
2021-05-19 872-275-0XXX 0000–0999Assigned IP HORIZON LLC 515J CHICGOZN01 IL
2021-05-19 872-277-5XXX 5000–5999Assigned IP HORIZON LLC 515J CHICGOZN05 IL
2021-05-19 872-283-8XXX 8000–8999Assigned IP HORIZON LLC 515J CHICGOZN07 IL
2021-05-19 872-732-8XXX 8000–8999Assigned IP HORIZON LLC 515J CHICGOZN08 IL
2021-05-19 872-758-9XXX 9000–9999Assigned IP HORIZON LLC 515J CHICGOZN10 IL
2020-10-05 872-274-1XXX 1000–1999Assigned IP HORIZON LLC 515J CHICGOZN04 IL
2016-07-11 872-204-8XXX 8000–8999Assigned IP HORIZON LLC 515J CHICGOZN08 IL
2016-07-11 872-204-9XXX 9000–9999Assigned IP HORIZON LLC 515J CHICGOZN08 IL
2016-07-11 872-231-7XXX 7000–7999Assigned IP HORIZON LLC 515J CHICGOZN05 IL
2016-07-11 872-231-8XXX 8000–8999Assigned IP HORIZON LLC 515J CHICGOZN05 IL
2016-07-11 872-281-9XXX 9000–9999Assigned IP HORIZON LLC 515J CHICGOZN06 IL
2016-07-11 872-772-2XXX 2000–2999Assigned IP HORIZON LLC 515J CHICGOZN04 IL
2016-07-11 872-772-3XXX 3000–3999Assigned IP HORIZON LLC 515J CHICGOZN04 IL
2016-07-11 872-903-8XXX 8000–8999Assigned IP HORIZON LLC 515J CHICGOZN09 IL
2016-07-11 872-903-9XXX 9000–9999Assigned IP HORIZON LLC 515J CHICGOZN09 IL
2013-07-29 872-210-6XXX 6000–6999Assigned IP HORIZON LLC 515J CHICGOZN04 IL
2013-07-29 872-244-9XXX 9000–9999Assigned IP HORIZON LLC 515J CHICGOZN07 IL
2013-07-29 872-803-0XXX 0000–0999Assigned IP HORIZON LLC 515J CHICGOZN10 IL
2013-04-09 872-205-8XXX 8000–8999Assigned IP HORIZON LLC 515J CHICGOZN06 IL
2013-04-09 872-999-1XXX 1000–1999Assigned IP HORIZON LLC 515J CHICGOZN02 IL

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.