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
2004-11-23 623-547-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-11-18 623-256-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-11-18 623-606-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-11-18 623-606-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-11-08 623-466-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2004-10-26 623-476-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-10-26 623-476-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-10-26 623-476-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-10-26 623-476-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-10-20 623-606-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2004-10-20 623-606-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2004-10-13 623-606-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-10-13 623-606-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-10-06 623-466-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2004-09-30 623-399-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2004-09-27 623-466-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-09-27 623-466-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-09-21 623-466-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2004-09-21 623-466-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2004-09-07 623-385-2XXX 2000–2999Assigned METROPCS, INC. 5562 PHOENIX AZ
2004-08-26 623-337-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2004-08-26 623-337-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2004-08-25 623-256-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-08-25 623-256-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-08-25 623-256-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-08-25 623-256-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-08-25 623-256-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-08-25 623-256-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-08-25 623-256-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-08-25 623-256-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-08-17 623-742-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2004-08-17 623-742-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2004-08-17 623-742-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2004-07-30 623-398-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-07-30 623-398-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-07-30 623-398-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-07-20 623-217-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2004-07-20 623-261-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2004-07-15 623-256-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-07-15 623-385-5XXX 5000–5999Assigned METROPCS, INC. 5562 PHOENIX AZ
2004-06-30 623-202-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2004-06-30 623-202-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2004-06-25 623-374-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-06-25 623-374-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-06-07 623-385-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2004-06-01 623-218-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-05-28 623-687-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-05-28 623-687-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-04-20 623-687-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-04-20 623-687-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 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.