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 323
T-MOBILE USA, INC. 825
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
2024-11-13 323-205-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LSAN DA 04 CA
2024-08-28 323-431-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 LSAN DA 12 CA
2024-07-12 323-205-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LSAN DA 04 CA
2024-07-12 323-212-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LSAN DA 11 CA
2024-06-21 323-760-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LSAN DA 14 CA
2024-04-12 323-824-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LSAN DA 14 CA
2023-12-05 323-909-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LSAN DA 04 CA
2023-11-21 323-591-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LSAN DA 13 CA
2023-01-11 323-297-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LSAN DA 13 CA
2023-01-11 323-904-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 LSAN DA 13 CA
2023-01-11 323-904-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LSAN DA 13 CA
2023-01-11 323-904-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LSAN DA 13 CA
2023-01-11 323-904-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LSAN DA 13 CA
2022-09-01 323-967-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2022-05-13 323-241-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2021-08-27 323-328-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LSAN DA 11 CA
2021-07-15 323-599-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2021-04-05 323-393-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2021-04-05 323-679-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2021-02-22 323-372-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LSAN DA 14 CA
2021-01-25 323-393-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2021-01-25 323-393-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2019-09-26 323-393-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2019-09-26 323-400-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2019-09-26 323-492-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2019-09-26 323-685-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 LSAN DA 05 CA
2019-09-26 323-760-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LSAN DA 14 CA
2019-09-26 323-760-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LSAN DA 14 CA
2019-09-26 323-760-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LSAN DA 14 CA
2019-09-26 323-770-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2019-09-26 323-772-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2019-08-26 323-330-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LSAN DA 13 CA
2019-08-26 323-595-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LSAN DA 13 CA
2019-08-26 323-949-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2019-08-26 323-949-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2019-08-05 323-949-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2019-08-05 323-949-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2019-07-29 323-418-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2019-07-29 323-529-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LSAN DA 11 CA
2019-07-29 323-639-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LSAN DA 11 CA
2019-07-29 323-641-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LSAN DA 11 CA
2019-07-29 323-678-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2019-07-29 323-754-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2019-07-29 323-755-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2019-07-29 323-776-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2019-07-15 323-796-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LSAN DA 05 CA
2019-06-06 323-949-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2019-06-06 323-949-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2019-03-19 323-949-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2019-03-19 323-949-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA

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.