NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 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. 1
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
2014-07-03 623-666-0XXX 0000–0999Assigned METROPCS, INC. 5562 PHOENIX AZ
2014-07-03 623-666-1XXX 1000–1999Assigned METROPCS, INC. 5562 PHOENIX AZ
2014-03-25 623-500-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-03-25 623-666-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-03-25 623-666-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-03-25 623-800-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-03-25 623-800-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-03-25 623-800-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-03-25 623-800-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-03-25 623-800-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-03-25 623-800-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-03-25 623-800-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-01-28 623-383-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-01-28 623-888-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-01-28 623-888-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-01-28 623-999-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-01-28 623-999-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-01-28 623-999-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-01-28 623-999-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-01-28 623-999-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2013-12-10 623-999-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2013-12-10 623-999-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2013-12-10 623-999-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2013-10-29 623-800-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2013-10-29 623-800-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2013-10-29 623-800-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2013-10-24 623-312-9XXX 9000–9999Assigned METROPCS, INC. 5562 PHOENIX AZ
2013-10-24 623-349-2XXX 2000–2999Assigned METROPCS, INC. 5562 PHOENIX AZ
2013-10-24 623-349-9XXX 9000–9999Assigned METROPCS, INC. 5562 PHOENIX AZ
2013-10-24 623-383-1XXX 1000–1999Assigned METROPCS, INC. 5562 PHOENIX AZ
2013-10-22 623-500-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2013-10-22 623-500-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2013-10-22 623-666-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2013-10-22 623-666-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2013-10-16 623-500-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2013-10-16 623-500-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2013-10-11 623-888-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J PHOENIX AZ
2013-09-27 623-999-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2013-09-27 623-999-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2013-09-19 623-500-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2013-09-19 623-500-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2013-09-19 623-500-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2013-09-17 623-223-5XXX 5000–5999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F PHOENIX AZ
2013-09-17 623-223-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F PHOENIX AZ
2013-08-30 623-777-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2013-08-30 623-777-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2013-07-22 623-666-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2013-07-15 623-312-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2013-07-15 623-777-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2013-06-26 623-312-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 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.