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
2021-08-12 623-624-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-08-12 623-624-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-08-12 623-624-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-08-12 623-624-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-08-12 623-624-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-08-12 623-624-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-08-12 623-624-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-08-12 623-624-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-08-12 623-624-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-07-21 623-273-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2021-07-01 623-273-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-07-01 623-273-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-07-01 623-273-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-07-01 623-273-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-07-01 623-273-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-07-01 623-273-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-07-01 623-273-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-06-30 623-270-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-06-30 623-270-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-06-29 623-270-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2021-06-10 623-270-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2021-05-19 623-270-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2021-05-19 623-270-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2021-04-23 623-268-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2021-04-23 623-268-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2021-04-23 623-268-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2021-04-22 623-887-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-04-22 623-887-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-04-22 623-887-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-04-22 623-887-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-04-22 623-887-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-04-22 623-887-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-04-22 623-887-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-04-22 623-887-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-04-22 623-887-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-04-22 623-887-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2021-03-31 623-270-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2021-03-31 623-270-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2021-03-31 623-270-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2021-03-31 623-270-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2021-03-26 623-268-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-03-26 623-268-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-03-26 623-268-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-03-23 623-254-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-03-23 623-920-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-03-23 623-920-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-03-02 623-920-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-03-02 623-920-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-03-02 623-920-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2021-03-02 623-920-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 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.