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 831
METROPCS, INC. 170
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
2022-09-22 831-260-1XXX 1000–1999Assigned METROPCS, INC. 5562 SOLEDAD CA
2022-09-22 831-388-0XXX 0000–0999Assigned METROPCS, INC. 5562 GREENFIELD CA
2021-02-18 831-529-0XXX 0000–0999Assigned METROPCS, INC. 5562 SANTA CRUZ CA
2021-01-08 831-305-4XXX 4000–4999Assigned METROPCS, INC. 5562 GONZALES CA
2020-10-21 831-292-1XXX 1000–1999Assigned METROPCS, INC. 5562 SOLEDAD CA
2020-10-21 831-785-0XXX 0000–0999Assigned METROPCS, INC. 5562 SALINAS CA
2020-10-21 831-785-1XXX 1000–1999Assigned METROPCS, INC. 5562 SALINAS CA
2020-09-29 831-297-5XXX 5000–5999Assigned METROPCS, INC. 5562 HOLLISTER CA
2019-07-31 831-292-0XXX 0000–0999Assigned METROPCS, INC. 5562 SOLEDAD CA
2019-07-31 831-316-6XXX 6000–6999Assigned METROPCS, INC. 5562 SANTA CRUZ CA
2018-05-08 831-276-2XXX 2000–2999Assigned METROPCS, INC. 5562 SALINAS CA
2018-05-08 831-276-8XXX 8000–8999Assigned METROPCS, INC. 5562 SALINAS CA
2018-05-08 831-276-9XXX 9000–9999Assigned METROPCS, INC. 5562 SALINAS CA
2018-05-08 831-500-3XXX 3000–3999Assigned METROPCS, INC. 5562 SALINAS CA
2018-05-08 831-500-4XXX 4000–4999Assigned METROPCS, INC. 5562 SALINAS CA
2018-05-08 831-789-0XXX 0000–0999Assigned METROPCS, INC. 5562 SALINAS CA
2018-05-08 831-789-1XXX 1000–1999Assigned METROPCS, INC. 5562 SALINAS CA
2018-04-04 831-500-7XXX 7000–7999Assigned METROPCS, INC. 5562 SALINAS CA
2018-04-04 831-500-8XXX 8000–8999Assigned METROPCS, INC. 5562 SALINAS CA
2018-04-04 831-500-9XXX 9000–9999Assigned METROPCS, INC. 5562 SALINAS CA
2018-04-04 831-666-8XXX 8000–8999Assigned METROPCS, INC. 5562 WATSONVL CA
2018-04-04 831-666-9XXX 9000–9999Assigned METROPCS, INC. 5562 WATSONVL CA
2017-11-30 831-665-2XXX 2000–2999Assigned METROPCS, INC. 5562 HOLLISTER CA
2017-09-18 831-276-5XXX 5000–5999Assigned METROPCS, INC. 5562 SALINAS CA
2017-09-18 831-276-6XXX 6000–6999Assigned METROPCS, INC. 5562 SALINAS CA
2017-09-18 831-439-4XXX 4000–4999Assigned METROPCS, INC. 5562 SANTA CRUZ CA
2017-09-18 831-613-0XXX 0000–0999Assigned METROPCS, INC. 5562 GREENFIELD CA
2017-06-28 831-276-1XXX 1000–1999Assigned METROPCS, INC. 5562 SALINAS CA
2017-06-28 831-276-3XXX 3000–3999Assigned METROPCS, INC. 5562 SALINAS CA
2017-03-02 831-315-0XXX 0000–0999Assigned METROPCS, INC. 5562 SOLEDAD CA
2017-03-02 831-386-6XXX 6000–6999Assigned METROPCS, INC. 5562 KING CITY CA
2017-03-02 831-393-5XXX 5000–5999Assigned METROPCS, INC. 5562 MONTEREY CA
2017-03-02 831-856-4XXX 4000–4999Assigned METROPCS, INC. 5562 GREENFIELD CA
2016-12-08 831-201-7XXX 7000–7999Assigned METROPCS, INC. 5562 SANTA CRUZ CA
2016-09-23 831-774-4XXX 4000–4999Assigned METROPCS, INC. 5562 GONZALES CA
2016-08-09 831-258-0XXX 0000–0999Assigned METROPCS, INC. 5562 SALINAS CA
2016-08-09 831-258-1XXX 1000–1999Assigned METROPCS, INC. 5562 SALINAS CA
2016-06-15 831-297-1XXX 1000–1999Assigned METROPCS, INC. 5562 HOLLISTER CA
2014-09-17 831-210-7XXX 7000–7999Assigned METROPCS, INC. 5562 SALINAS CA
2014-09-17 831-785-9XXX 9000–9999Assigned METROPCS, INC. 5562 SALINAS CA
2014-05-20 831-975-9XXX 9000–9999Assigned METROPCS, INC. 5562 SALINAS CA
2013-09-23 831-998-5XXX 5000–5999Assigned METROPCS, INC. 5562 SALINAS CA
2013-07-02 831-237-9XXX 9000–9999Assigned METROPCS, INC. 5562 SOLEDAD CA
2013-07-02 831-998-6XXX 6000–6999Assigned METROPCS, INC. 5562 SALINAS CA
2013-04-10 831-205-8XXX 8000–8999Assigned METROPCS, INC. 5562 HOLLISTER CA
2012-09-10 831-756-6XXX 6000–6999Assigned METROPCS, INC. 5562 SALINAS CA
2012-09-10 831-756-8XXX 8000–8999Assigned METROPCS, INC. 5562 SALINAS CA
2012-09-10 831-756-9XXX 9000–9999Assigned METROPCS, INC. 5562 SALINAS CA
2012-09-10 831-783-8XXX 8000–8999Assigned METROPCS, INC. 5562 SALINAS CA
2012-07-17 831-428-4XXX 4000–4999Assigned METROPCS, INC. 5562 SANTA CRUZ 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.