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
2004-04-20 623-687-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-04-20 623-687-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-04-20 623-687-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-04-06 623-398-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2004-04-06 623-398-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2004-03-29 623-388-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-03-29 623-388-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-03-29 623-388-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-03-01 623-374-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-03-01 623-374-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-03-01 623-374-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-02-10 623-293-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-02-10 623-556-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-02-10 623-556-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2004-02-09 623-217-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-01-13 623-328-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-01-13 623-328-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2004-01-05 623-308-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2004-01-05 623-308-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2003-12-16 623-293-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2003-12-16 623-293-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2003-12-01 623-308-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2003-12-01 623-308-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2003-12-01 623-308-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2003-10-29 623-466-1XXX 1000–1999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2003-10-24 623-215-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2003-10-24 623-215-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2003-10-24 623-215-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2003-10-13 623-293-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2003-10-13 623-293-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2003-10-13 623-293-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2003-10-13 623-293-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2003-10-13 623-670-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2003-10-13 623-670-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2003-10-06 623-215-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2003-09-05 623-523-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2003-09-05 623-523-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2003-09-05 623-523-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2003-09-05 623-523-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2003-08-07 623-866-4XXX 4000–4999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2003-08-07 623-866-5XXX 5000–5999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2003-08-07 623-866-6XXX 6000–6999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2003-08-07 623-866-7XXX 7000–7999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2003-08-06 623-215-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2003-08-06 623-215-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2003-08-06 623-215-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2003-07-16 623-512-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2003-07-16 623-670-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2003-07-16 623-670-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2003-07-16 623-670-2XXX 2000–2999Assigned 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.