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
2019-08-07 623-259-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2019-07-09 623-259-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2019-07-01 623-259-0XXX 0000–0999Assigned TELNYX LLC 073H PHOENIX AZ
2019-06-18 623-259-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2019-05-30 623-473-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-05-30 623-473-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-05-30 623-473-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-05-30 623-473-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-05-30 623-473-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-05-30 623-473-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-05-30 623-473-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-05-30 623-473-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-05-30 623-473-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PHOENIX AZ
2019-03-27 623-248-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2019-03-27 623-248-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2019-03-27 623-248-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2019-03-27 623-248-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2019-03-27 623-248-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2019-03-27 623-248-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2019-03-27 623-248-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2019-03-27 623-248-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2019-03-27 623-248-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2019-03-25 623-526-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-03-25 623-526-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-03-25 623-526-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-03-25 623-526-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-03-25 623-526-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-03-25 623-526-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-03-25 623-526-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-03-25 623-526-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-03-25 623-526-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-03-25 623-526-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-03-18 623-246-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-03-18 623-246-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-03-18 623-246-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2019-02-15 623-248-2XXX 2000–2999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2019-02-12 623-246-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2019-01-23 623-246-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PHOENIX AZ
2019-01-22 623-246-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-01-22 623-246-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-01-22 623-562-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-01-22 623-562-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-01-22 623-745-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2019-01-15 623-246-0XXX 0000–0999Assigned METROPCS, INC. 5562 PHOENIX AZ
2019-01-15 623-246-9XXX 9000–9999Assigned METROPCS, INC. 5562 PHOENIX AZ
2019-01-10 623-231-9XXX 9000–9999Assigned METROPCS, INC. 5562 PHOENIX AZ
2018-11-05 623-401-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2018-11-05 623-401-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2018-11-05 623-401-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2018-11-05 623-401-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E 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.