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
2005-04-08 623-670-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2005-04-08 623-691-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2005-03-15 623-537-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-03-15 623-792-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-03-15 623-792-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-03-15 623-792-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-03-11 623-824-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-03-11 623-824-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-03-11 623-824-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-03-11 623-824-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-03-07 623-388-7XXX 7000–7999Assigned METROPCS, INC. 5562 PHOENIX AZ
2005-03-02 623-742-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-03-02 623-742-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-02-17 623-707-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-02-17 623-707-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-02-17 623-707-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-01-31 623-853-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-01-31 623-853-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-01-27 623-748-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2005-01-27 623-760-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2005-01-27 623-760-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2005-01-27 623-760-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2005-01-21 623-308-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-01-21 623-703-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-01-21 623-703-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-01-19 623-478-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-01-19 623-505-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-01-19 623-505-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-01-19 623-518-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-01-13 623-298-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-01-12 623-748-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2005-01-12 623-748-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2005-01-12 623-748-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2005-01-10 623-748-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2005-01-03 623-537-5XXX 5000–5999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2004-12-29 623-455-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2004-12-29 623-455-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2004-12-29 623-734-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2004-12-29 623-734-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2004-12-29 623-734-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2004-12-29 623-734-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2004-12-21 623-556-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-12-10 623-518-5XXX 5000–5999Assigned METROPCS, INC. 5562 PHOENIX AZ
2004-12-10 623-518-7XXX 7000–7999Assigned METROPCS, INC. 5562 PHOENIX AZ
2004-12-10 623-518-8XXX 8000–8999Assigned METROPCS, INC. 5562 PHOENIX AZ
2004-12-03 623-385-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2004-12-03 623-385-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2004-12-01 623-327-9XXX 9000–9999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2004-11-23 623-547-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-11-23 623-547-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J 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.