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 773
T-MOBILE USA, INC. 1149
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
2025-05-19 773-942-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2025-05-19 773-942-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2025-04-25 773-423-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2025-04-25 773-423-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2025-04-25 773-442-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2025-01-07 773-335-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN09 IL
2025-01-07 773-335-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN09 IL
2025-01-07 773-335-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN09 IL
2024-02-07 773-514-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN09 IL
2023-12-15 773-514-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN09 IL
2023-12-15 773-514-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN09 IL
2023-09-01 773-200-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2023-09-01 773-200-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2023-09-01 773-200-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2023-09-01 773-200-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2023-09-01 773-200-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2023-09-01 773-200-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2023-08-25 773-872-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2023-08-25 773-872-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2023-08-25 773-872-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2023-08-25 773-872-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2022-08-24 773-461-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2022-08-24 773-461-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2022-08-24 773-461-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2022-02-14 773-435-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2021-11-03 773-955-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2021-09-29 773-280-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2021-09-29 773-349-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2021-09-29 773-521-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2021-09-29 773-542-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2021-09-29 773-542-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2021-09-29 773-638-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2021-09-29 773-757-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2021-09-29 773-762-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2021-09-29 773-801-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2021-09-29 773-823-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2021-09-29 773-827-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2021-09-29 773-827-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2021-09-29 773-827-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2021-09-29 773-893-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2021-09-20 773-373-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2021-09-20 773-483-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2021-09-20 773-487-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2021-09-20 773-493-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2021-09-20 773-538-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2021-09-20 773-684-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2021-09-20 773-684-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2021-09-20 773-684-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2021-09-07 773-302-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2021-09-07 773-302-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL

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.