NumberResearch Membership · Data 09/23/2026

Recent thousands-block assignments

0 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, all time — NPA 503
T-MOBILE USA, INC. 186
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
2020-07-24 503-344-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CLACKAMAS OR
2020-07-24 503-344-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CLACKAMAS OR
2018-07-13 503-354-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TILLAMOOK OR
2018-07-13 503-354-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TILLAMOOK OR
2018-04-06 503-457-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 TILLAMOOK OR
2018-04-06 503-457-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 TILLAMOOK OR
2018-01-03 503-374-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 TILLAMOOK OR
2018-01-03 503-374-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TILLAMOOK OR
2018-01-03 503-374-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TILLAMOOK OR
2017-12-04 503-864-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 DAYTON OR
2017-09-29 503-374-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TILLAMOOK OR
2017-09-29 503-374-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TILLAMOOK OR
2017-09-22 503-744-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CLACKAMAS OR
2017-08-15 503-374-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TILLAMOOK OR
2014-03-04 503-902-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 WOODBURN OR
2010-07-08 503-739-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SEASIDE OR
2010-06-11 503-583-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 MCMINNVL OR
2010-03-10 503-388-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2010-01-25 503-583-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 MCMINNVL OR
2010-01-25 503-902-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 WOODBURN OR
2009-01-29 503-583-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 MCMINNVL OR
2008-09-08 503-505-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2008-07-02 503-719-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2008-06-12 503-468-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 ASTORIA OR
2008-06-09 503-501-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2008-06-06 503-400-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SALEM OR
2008-03-13 503-560-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 MCMINNVL OR
2008-03-03 503-935-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2008-03-03 503-935-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2008-02-13 503-400-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SALEM OR
2008-01-31 503-954-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2008-01-31 503-954-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2008-01-31 503-954-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2008-01-31 503-954-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2008-01-17 503-896-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2007-12-21 503-438-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 ST HELENS OR
2007-12-21 503-896-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2007-10-17 503-383-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SALEM OR
2007-09-19 503-383-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SALEM OR
2007-09-10 503-406-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CLACKAMAS OR
2007-09-04 503-857-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 MCMINNVL OR
2007-07-18 503-200-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2007-06-21 503-200-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2007-06-05 503-734-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2007-05-16 503-302-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SALEM OR
2007-05-16 503-488-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2007-03-06 503-586-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SALEM OR
2007-01-11 503-863-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PORTLAND OR
2007-01-08 503-856-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SALEM OR
2007-01-08 503-856-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SALEM OR

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.