NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

1 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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
2013-06-14 623-312-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2013-06-03 623-383-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2013-06-03 623-383-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2013-06-03 623-383-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2013-04-18 623-383-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2013-03-25 623-777-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2013-03-25 623-777-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2013-03-11 623-777-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2013-03-11 623-777-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2013-03-11 623-777-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2013-02-26 623-299-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2013-02-26 623-299-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2013-02-26 623-299-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2013-02-06 623-500-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2013-02-06 623-500-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2013-01-22 623-312-4XXX 4000–4999Assigned METROPCS, INC. 5562 PHOENIX AZ
2013-01-22 623-312-5XXX 5000–5999Assigned METROPCS, INC. 5562 PHOENIX AZ
2013-01-22 623-312-6XXX 6000–6999Assigned METROPCS, INC. 5562 PHOENIX AZ
2013-01-22 623-312-7XXX 7000–7999Assigned METROPCS, INC. 5562 PHOENIX AZ
2013-01-22 623-312-8XXX 8000–8999Assigned METROPCS, INC. 5562 PHOENIX AZ
2013-01-09 623-888-0XXX 0000–0999Assigned METROPCS, INC. 5562 PHOENIX AZ
2013-01-09 623-888-1XXX 1000–1999Assigned METROPCS, INC. 5562 PHOENIX AZ
2013-01-09 623-888-2XXX 2000–2999Assigned METROPCS, INC. 5562 PHOENIX AZ
2012-11-30 623-312-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2012-11-21 623-666-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2012-11-21 623-666-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2012-11-21 623-666-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2012-11-16 623-383-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2012-11-16 623-383-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2012-11-16 623-383-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2012-11-16 623-383-9XXX 9000–9999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2012-10-16 623-299-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2012-10-16 623-299-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2012-10-16 623-299-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2012-10-16 623-299-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2012-10-01 623-888-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J PHOENIX AZ
2012-09-25 623-299-9XXX 9000–9999Assigned RE-INVENT TELECOM, LLC - AZ 663G PHOENIX AZ
2012-09-19 623-888-7XXX 7000–7999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2012-07-23 623-888-6XXX 6000–6999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F PHOENIX AZ
2012-06-04 623-282-1XXX 1000–1999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F PHOENIX AZ
2012-06-04 623-282-2XXX 2000–2999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F PHOENIX AZ
2012-06-04 623-282-4XXX 4000–4999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F PHOENIX AZ
2012-06-04 623-295-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F PHOENIX AZ
2012-06-04 623-335-2XXX 2000–2999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F PHOENIX AZ
2012-06-04 623-396-5XXX 5000–5999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F PHOENIX AZ
2012-06-04 623-396-6XXX 6000–6999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F PHOENIX AZ
2012-06-04 623-777-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F PHOENIX AZ
2012-06-01 623-299-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2012-05-24 623-888-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F PHOENIX AZ
2012-05-04 623-299-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.