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
2005-09-28 623-399-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-09-22 623-433-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-09-14 623-734-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-09-14 623-882-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-09-14 623-882-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-09-12 623-606-4XXX 4000–4999Assigned METROPCS, INC. 5562 PHOENIX AZ
2005-08-30 623-889-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2005-08-30 623-889-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2005-08-30 623-889-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2005-08-25 623-308-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-08-25 623-308-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-08-23 623-399-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-08-23 623-399-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-08-23 623-399-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-08-23 623-444-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-08-23 623-444-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-08-23 623-444-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-08-23 623-444-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-08-23 623-444-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-08-19 623-399-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-08-19 623-399-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-07-13 623-218-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-07-13 623-853-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-07-11 623-866-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-07-11 623-866-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-07-11 623-866-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-07-11 623-866-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-07-07 623-882-4XXX 4000–4999Assigned METROPCS, INC. 5562 PHOENIX AZ
2005-06-15 623-760-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-06-15 623-824-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-06-15 623-845-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-06-10 623-776-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-06-10 623-776-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2005-06-07 623-734-8XXX 8000–8999Assigned METROPCS, INC. 5562 PHOENIX AZ
2005-05-18 623-889-6XXX 6000–6999Assigned ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 PHOENIX AZ
2005-05-17 623-337-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-05-17 623-337-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-05-17 623-533-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-05-17 623-533-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-05-17 623-533-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-05-17 623-533-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-05-17 623-748-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-05-17 623-748-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-05-17 623-748-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2005-05-17 623-760-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2005-04-25 623-518-0XXX 0000–0999Assigned METROPCS, INC. 5562 PHOENIX AZ
2005-04-08 623-399-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2005-04-08 623-444-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2005-04-08 623-444-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2005-04-08 623-643-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 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.