NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

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 231
METROPCS, INC. 39
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
2021-10-13 231-454-0XXX 0000–0999Assigned METROPCS, INC. 5562 TRAVERSECY MI
2021-09-28 231-284-1XXX 1000–1999Assigned METROPCS, INC. 5562 MANISTEE MI
2021-09-28 231-707-5XXX 5000–5999Assigned METROPCS, INC. 5562 NEWAYGO MI
2021-09-27 231-279-4XXX 4000–4999Assigned METROPCS, INC. 5562 BIG RAPIDS MI
2021-09-23 231-454-4XXX 4000–4999Assigned METROPCS, INC. 5562 TRAVERSECY MI
2021-09-23 231-454-9XXX 9000–9999Assigned METROPCS, INC. 5562 TRAVERSECY MI
2021-09-22 231-550-9XXX 9000–9999Assigned METROPCS, INC. 5562 PETOSKEY MI
2021-09-20 231-880-2XXX 2000–2999Assigned METROPCS, INC. 5562 MUSKEGON MI
2021-09-20 231-968-3XXX 3000–3999Assigned METROPCS, INC. 5562 CADILLAC MI
2021-09-20 231-968-8XXX 8000–8999Assigned METROPCS, INC. 5562 CADILLAC MI
2021-09-09 231-253-5XXX 5000–5999Assigned METROPCS, INC. 5562 CADILLAC MI
2021-09-09 231-281-0XXX 0000–0999Assigned METROPCS, INC. 5562 CADILLAC MI
2021-09-09 231-281-1XXX 1000–1999Assigned METROPCS, INC. 5562 CADILLAC MI
2021-09-09 231-285-6XXX 6000–6999Assigned METROPCS, INC. 5562 CADILLAC MI
2021-09-09 231-370-0XXX 0000–0999Assigned METROPCS, INC. 5562 MUSKEGON MI
2021-09-09 231-786-4XXX 4000–4999Assigned METROPCS, INC. 5562 TRAVERSECY MI
2021-09-09 231-786-5XXX 5000–5999Assigned METROPCS, INC. 5562 TRAVERSECY MI
2021-09-09 231-786-6XXX 6000–6999Assigned METROPCS, INC. 5562 TRAVERSECY MI
2021-04-08 231-567-3XXX 3000–3999Assigned METROPCS, INC. 5562 MUSKEGON MI
2021-02-18 231-254-3XXX 3000–3999Assigned METROPCS, INC. 5562 PETOSKEY MI
2021-02-18 231-254-4XXX 4000–4999Assigned METROPCS, INC. 5562 PETOSKEY MI
2021-02-18 231-281-4XXX 4000–4999Assigned METROPCS, INC. 5562 CADILLAC MI
2021-02-18 231-281-5XXX 5000–5999Assigned METROPCS, INC. 5562 CADILLAC MI
2020-06-02 231-531-4XXX 4000–4999Assigned METROPCS, INC. 5562 MUSKEGON MI
2020-06-02 231-531-5XXX 5000–5999Assigned METROPCS, INC. 5562 MUSKEGON MI
2019-04-10 231-531-9XXX 9000–9999Assigned METROPCS, INC. 5562 MUSKEGON MI
2017-07-24 231-493-3XXX 3000–3999Assigned METROPCS, INC. 5562 TRAVERSECY MI
2017-07-24 231-493-4XXX 4000–4999Assigned METROPCS, INC. 5562 TRAVERSECY MI
2015-07-31 231-303-7XXX 7000–7999Assigned METROPCS, INC. 5562 NEWAYGO MI
2014-02-24 231-375-3XXX 3000–3999Assigned METROPCS, INC. 5562 MUSKEGON MI
2014-02-24 231-375-4XXX 4000–4999Assigned METROPCS, INC. 5562 MUSKEGON MI
2011-12-28 231-299-9XXX 9000–9999Assigned METROPCS, INC. 5562 MANISTEE MI
2009-02-26 231-683-0XXX 0000–0999Assigned METROPCS, INC. 5562 MUSKEGON MI
2009-02-26 231-683-3XXX 3000–3999Assigned METROPCS, INC. 5562 MUSKEGON MI
2009-02-26 231-683-5XXX 5000–5999Assigned METROPCS, INC. 5562 MUSKEGON MI
2009-02-26 231-683-6XXX 6000–6999Assigned METROPCS, INC. 5562 MUSKEGON MI
2009-02-26 231-683-7XXX 7000–7999Assigned METROPCS, INC. 5562 MUSKEGON MI
2009-02-26 231-683-8XXX 8000–8999Assigned METROPCS, INC. 5562 MUSKEGON MI
2005-11-21 231-408-4XXX 4000–4999Assigned METROPCS, INC. 5562 BIG RAPIDS MI

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.