NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

2 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, 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
2021-12-02 623-280-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-12-02 623-280-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-12-02 623-280-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-12-02 623-280-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-12-02 623-280-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-12-02 623-280-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-12-02 623-280-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-11-12 623-279-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2021-11-12 623-279-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2021-11-12 623-279-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2021-11-12 623-279-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2021-11-12 623-279-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2021-11-12 623-279-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2021-11-12 623-279-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2021-11-12 623-279-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2021-11-12 623-279-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2021-11-12 623-279-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2021-10-19 623-278-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-10-19 623-278-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-10-19 623-278-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-10-19 623-278-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-10-19 623-278-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-10-19 623-278-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-10-19 623-278-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-10-19 623-278-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-10-13 623-274-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-10-13 623-274-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-10-13 623-274-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-10-13 623-274-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-10-13 623-274-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-10-13 623-274-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-10-13 623-274-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-10-13 623-274-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-10-13 623-275-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-10-13 623-278-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-10-07 623-274-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2021-10-07 623-274-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2021-10-04 623-278-0XXX 0000–0999Assigned TELNYX LLC 073H PHOENIX AZ
2021-09-14 623-275-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-09-14 623-275-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-09-14 623-275-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-09-14 623-275-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-09-14 623-275-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-09-14 623-275-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-09-14 623-275-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-09-14 623-275-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-09-14 623-275-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-09-10 623-273-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-09-01 623-273-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2021-08-12 623-624-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ

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.