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
2020-02-17 623-250-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2020-02-17 623-250-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2020-02-17 623-250-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2020-01-31 623-253-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-01-31 623-253-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-01-31 623-253-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-01-31 623-253-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-01-31 623-253-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-01-31 623-253-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-01-31 623-253-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-01-31 623-253-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2020-01-22 623-253-0XXX 0000–0999Assigned TELNYX LLC 073H PHOENIX AZ
2020-01-08 623-253-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2019-12-20 623-263-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-12-20 623-263-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-12-20 623-263-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-12-20 623-263-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-12-20 623-263-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-12-20 623-263-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-12-20 623-263-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-12-20 623-263-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-12-20 623-263-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-12-20 623-263-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-11-14 623-600-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-11-14 623-600-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-11-14 623-600-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-11-14 623-600-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-11-13 623-246-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PHOENIX AZ
2019-11-08 623-259-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2019-11-08 623-471-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2019-11-08 623-600-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2019-11-08 623-600-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2019-11-08 623-600-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2019-11-08 623-600-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2019-10-14 623-471-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-10-14 623-471-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-10-14 623-471-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-10-14 623-471-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-09-16 623-600-0XXX 0000–0999Assigned FRACTEL, LLC 965H PHOENIX AZ
2019-09-16 623-600-6XXX 6000–6999Assigned FRACTEL, LLC 965H PHOENIX AZ
2019-09-12 623-471-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-09-12 623-471-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-09-12 623-471-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-08-27 623-471-2XXX 2000–2999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2019-08-27 623-471-3XXX 3000–3999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2019-08-14 623-259-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-08-14 623-259-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-08-14 623-259-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-08-14 623-259-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-08-14 623-259-8XXX 8000–8999Assigned 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.