NumberResearch Membership · Data 09/23/2026

Recent thousands-block assignments

59 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/23/2026

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
T-MOBILE USA, INC. 59
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
2021-02-19 951-578-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2021-02-19 951-578-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2021-02-19 951-578-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2021-02-19 951-578-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2021-02-18 564-202-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 BREMERTON WA
2021-02-18 564-202-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BREMERTON WA
2021-02-18 564-202-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BREMERTON WA
2021-02-18 815-615-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 MENDOTA IL
2021-02-18 831-297-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HOLLISTER CA
2021-02-18 840-600-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 COLTON CA
2021-02-18 840-600-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 COLTON CA
2021-02-18 858-588-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 RNCHOBRNDO CA
2021-02-18 858-588-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 RNCHOBRNDO CA
2021-02-18 858-588-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 RNCHOBRNDO CA
2021-02-17 253-366-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TACOMA WA
2021-02-17 253-366-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 TACOMA WA
2021-02-17 253-366-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 TACOMA WA
2021-02-17 406-607-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 KALISPELL MT
2021-02-17 669-946-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2021-02-17 669-946-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2021-02-17 669-946-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2021-02-17 669-946-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2021-02-17 669-946-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2021-02-17 858-305-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNDG MRMS CA
2021-02-17 858-305-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNDG MRMS CA
2021-02-17 858-305-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNDG MRMS CA
2021-02-17 970-501-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 DURANGO CO
2021-02-17 970-501-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 DURANGO CO
2021-02-16 213-442-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LSAN DA 01 CA
2021-02-16 213-442-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LSAN DA 01 CA
2021-02-16 213-442-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LSAN DA 01 CA
2021-02-16 213-547-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 LSAN DA 01 CA
2021-02-16 213-547-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LSAN DA 01 CA
2021-02-16 213-547-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LSAN DA 01 CA
2021-02-16 254-856-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 MARLIN TX
2021-02-16 509-516-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 WALLAWALLA WA
2021-02-16 509-518-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 KENNEWICK WA
2021-02-16 564-209-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 WHATCOMCTY WA
2021-02-16 564-209-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 WHATCOMCTY WA
2021-02-16 620-418-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 FORT SCOTT KS
2021-02-16 620-419-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PRATT KS
2021-02-16 661-627-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNCA NHCS CA
2021-02-16 661-627-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNCA NHCS CA
2021-02-16 669-609-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CAMPBELL CA
2021-02-16 669-609-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CAMPBELL CA
2021-02-16 669-609-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CAMPBELL CA
2021-02-16 669-609-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CAMPBELL CA
2021-02-16 669-609-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CAMPBELL CA
2021-02-16 830-219-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CARRIZOSPG TX
2021-02-16 830-328-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BANDERA TX

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.