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 857
METROPCS, INC. 202
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
2024-11-01 857-426-2XXX 2000–2999Assigned METROPCS, INC. 5562 BROOKLINE MA
2024-11-01 857-429-8XXX 8000–8999Assigned METROPCS, INC. 5562 ROXBURY MA
2024-11-01 857-605-4XXX 4000–4999Assigned METROPCS, INC. 5562 BRIGHTON MA
2023-08-17 857-497-9XXX 9000–9999Assigned METROPCS, INC. 5562 CHARLESTN MA
2020-05-28 857-353-1XXX 1000–1999Assigned METROPCS, INC. 5562 BOSTON MA
2020-05-20 857-326-0XXX 0000–0999Assigned METROPCS, INC. 5562 BOSTON MA
2020-05-20 857-326-9XXX 9000–9999Assigned METROPCS, INC. 5562 BOSTON MA
2020-05-20 857-335-0XXX 0000–0999Assigned METROPCS, INC. 5562 BOSTON MA
2020-05-20 857-335-6XXX 6000–6999Assigned METROPCS, INC. 5562 BOSTON MA
2020-05-20 857-353-0XXX 0000–0999Assigned METROPCS, INC. 5562 BOSTON MA
2018-09-26 857-326-1XXX 1000–1999Assigned METROPCS, INC. 5562 BOSTON MA
2018-09-26 857-326-2XXX 2000–2999Assigned METROPCS, INC. 5562 BOSTON MA
2018-09-26 857-326-3XXX 3000–3999Assigned METROPCS, INC. 5562 BOSTON MA
2018-09-26 857-326-4XXX 4000–4999Assigned METROPCS, INC. 5562 BOSTON MA
2018-09-26 857-326-7XXX 7000–7999Assigned METROPCS, INC. 5562 BOSTON MA
2018-09-26 857-326-8XXX 8000–8999Assigned METROPCS, INC. 5562 BOSTON MA
2018-07-09 857-343-9XXX 9000–9999Assigned METROPCS, INC. 5562 BOSTON MA
2018-07-09 857-346-6XXX 6000–6999Assigned METROPCS, INC. 5562 BOSTON MA
2018-07-09 857-346-7XXX 7000–7999Assigned METROPCS, INC. 5562 BOSTON MA
2018-07-09 857-346-8XXX 8000–8999Assigned METROPCS, INC. 5562 BOSTON MA
2018-07-09 857-346-9XXX 9000–9999Assigned METROPCS, INC. 5562 BOSTON MA
2018-06-20 857-346-3XXX 3000–3999Assigned METROPCS, INC. 5562 BOSTON MA
2018-06-20 857-346-4XXX 4000–4999Assigned METROPCS, INC. 5562 BOSTON MA
2018-06-20 857-346-5XXX 5000–5999Assigned METROPCS, INC. 5562 BOSTON MA
2017-08-28 857-773-3XXX 3000–3999Assigned METROPCS, INC. 5562 JAMAICA PL MA
2017-05-10 857-773-7XXX 7000–7999Assigned METROPCS, INC. 5562 JAMAICA PL MA
2017-02-01 857-287-0XXX 0000–0999Assigned METROPCS, INC. 5562 BOSTON MA
2017-02-01 857-287-4XXX 4000–4999Assigned METROPCS, INC. 5562 BOSTON MA
2017-02-01 857-287-5XXX 5000–5999Assigned METROPCS, INC. 5562 BOSTON MA
2017-02-01 857-287-6XXX 6000–6999Assigned METROPCS, INC. 5562 BOSTON MA
2017-02-01 857-287-7XXX 7000–7999Assigned METROPCS, INC. 5562 BOSTON MA
2017-02-01 857-287-8XXX 8000–8999Assigned METROPCS, INC. 5562 BOSTON MA
2017-02-01 857-287-9XXX 9000–9999Assigned METROPCS, INC. 5562 BOSTON MA
2016-09-22 857-505-5XXX 5000–5999Assigned METROPCS, INC. 5562 BOSTON MA
2016-09-22 857-505-6XXX 6000–6999Assigned METROPCS, INC. 5562 BOSTON MA
2016-09-22 857-505-7XXX 7000–7999Assigned METROPCS, INC. 5562 BOSTON MA
2016-09-22 857-505-8XXX 8000–8999Assigned METROPCS, INC. 5562 BOSTON MA
2016-09-22 857-505-9XXX 9000–9999Assigned METROPCS, INC. 5562 BOSTON MA
2016-09-14 857-773-9XXX 9000–9999Assigned METROPCS, INC. 5562 JAMAICA PL MA
2016-07-19 857-762-9XXX 9000–9999Assigned METROPCS, INC. 5562 BOSTON MA
2016-07-13 857-406-6XXX 6000–6999Assigned METROPCS, INC. 5562 BOSTON MA
2016-07-13 857-406-8XXX 8000–8999Assigned METROPCS, INC. 5562 BOSTON MA
2016-07-13 857-406-9XXX 9000–9999Assigned METROPCS, INC. 5562 BOSTON MA
2016-05-26 857-800-6XXX 6000–6999Assigned METROPCS, INC. 5562 BOSTON MA
2016-05-26 857-800-7XXX 7000–7999Assigned METROPCS, INC. 5562 BOSTON MA
2016-05-26 857-990-8XXX 8000–8999Assigned METROPCS, INC. 5562 BOSTON MA
2016-04-19 857-880-0XXX 0000–0999Assigned METROPCS, INC. 5562 BOSTON MA
2016-04-19 857-880-6XXX 6000–6999Assigned METROPCS, INC. 5562 BOSTON MA
2016-04-19 857-880-7XXX 7000–7999Assigned METROPCS, INC. 5562 BOSTON MA
2016-04-19 857-880-9XXX 9000–9999Assigned METROPCS, INC. 5562 BOSTON MA

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.