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
2012-05-02 623-238-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2012-04-23 623-419-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2012-04-23 623-419-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2012-04-23 623-419-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2012-03-09 623-777-7XXX 7000–7999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F PHOENIX AZ
2012-02-13 623-419-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2012-02-13 623-419-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2012-02-13 623-419-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2012-02-13 623-419-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2012-01-31 623-419-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2012-01-31 623-419-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2012-01-26 623-282-9XXX 9000–9999Assigned PAETEC ITEL, LLC 829J PHOENIX AZ
2012-01-25 623-396-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2012-01-25 623-396-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2012-01-13 623-282-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2012-01-13 623-282-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2011-11-28 623-282-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2011-11-28 623-282-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2011-11-28 623-282-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2011-10-07 623-396-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2011-10-07 623-396-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2011-10-07 623-396-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2011-10-05 623-282-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2011-09-29 623-295-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2011-09-02 623-396-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2011-09-02 623-396-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2011-09-02 623-396-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2011-08-30 623-295-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2011-08-30 623-295-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2011-08-30 623-295-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2011-08-30 623-295-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2011-08-30 623-295-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2011-07-27 623-428-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2011-07-27 623-428-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2011-07-27 623-428-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2011-07-25 623-295-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2011-07-25 623-295-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2011-07-25 623-295-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2011-07-18 623-335-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2011-07-18 623-335-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2011-07-18 623-335-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2011-07-18 623-335-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2011-07-18 623-335-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2011-07-18 623-335-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2011-07-18 623-335-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2011-07-18 623-335-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2011-07-18 623-335-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2011-07-18 623-387-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2011-07-18 623-387-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2011-07-01 623-760-9XXX 9000–9999Assigned ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 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.