NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

2 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, last 30 days — NPA 623
BOOST SUBSCRIBERCO L.L.C. 2
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
2020-07-15 623-400-4XXX 4000–4999Assigned FRACTEL, LLC 965H PHOENIX AZ
2020-07-08 623-632-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2020-07-08 623-632-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2020-07-08 623-632-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2020-07-08 623-632-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2020-07-08 623-632-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2020-06-25 623-632-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2020-06-25 623-632-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2020-06-25 623-632-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2020-06-19 623-257-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2020-06-19 623-257-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2020-06-19 623-257-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2020-06-19 623-257-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2020-06-19 623-257-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2020-04-07 623-250-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-04-07 623-254-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-04-07 623-254-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-04-07 623-254-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-04-07 623-254-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-04-07 623-254-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-03-31 623-254-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2020-03-31 623-254-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2020-03-16 623-254-0XXX 0000–0999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PHOENIX AZ
2020-03-06 623-254-9XXX 9000–9999Assigned METROPCS, INC. 5562 PHOENIX AZ
2020-03-06 623-663-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-03-06 623-663-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-03-06 623-663-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-03-06 623-663-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-03-06 623-663-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-03-06 623-663-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-03-06 623-663-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-03-06 623-663-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-03-06 623-663-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-03-06 623-663-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-03-02 623-250-8XXX 8000–8999Assigned METROPCS, INC. 5562 PHOENIX AZ
2020-03-02 623-250-9XXX 9000–9999Assigned METROPCS, INC. 5562 PHOENIX AZ
2020-02-21 623-323-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-02-21 623-323-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-02-21 623-323-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-02-21 623-323-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-02-21 623-323-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-02-21 623-323-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-02-21 623-323-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-02-21 623-323-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-02-21 623-323-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-02-21 623-323-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-02-17 623-250-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2020-02-17 623-250-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2020-02-17 623-250-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2020-02-17 623-250-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ

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.