NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

31 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 657
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 30
BANDWIDTH.COM CLEC, LLC - CA 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
2016-11-21 657-345-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 YORBALINDA CA
2016-11-21 657-348-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F ORANGE CA
2016-11-18 657-349-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-349-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-349-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-349-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-349-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-349-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-349-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-349-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-349-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-349-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-350-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-350-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-350-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-350-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-350-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-350-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-350-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-350-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-350-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-18 657-350-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-16 657-345-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C YORBALINDA CA
2016-11-15 657-306-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-15 657-306-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-15 657-340-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-15 657-340-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-15 657-340-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-15 657-340-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-11-15 657-345-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F YORBALINDA CA
2016-11-15 657-351-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SILVERADO CA
2016-11-09 657-342-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 HUNTITNBCH CA
2016-11-08 657-298-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CYPRESS CA
2016-11-08 657-347-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ANAHEIM CA
2016-11-08 657-347-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ANAHEIM CA
2016-11-08 657-347-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ANAHEIM CA
2016-11-02 657-351-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SILVERADO CA
2016-11-02 657-351-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SILVERADO CA
2016-10-31 657-340-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 WESTMINSTR CA
2016-10-31 657-345-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 YORBALINDA CA
2016-10-26 657-341-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BREA CA
2016-09-30 657-253-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FULLERTON CA
2016-09-30 657-445-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 FULLERTON CA
2016-09-28 657-346-2XXX 2000–2999Assigned TWC IP ENABLED SERVICES, LLC 793K SANTA ANA CA
2016-09-27 657-346-1XXX 1000–1999Assigned METROPCS NETWORKS, LLC 899D SANTA ANA CA
2016-09-23 657-340-1XXX 1000–1999Assigned TWC IP ENABLED SERVICES, LLC 793K WESTMINSTR CA
2016-09-21 657-295-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C ANAHEIM CA
2016-09-21 657-315-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C PLACENTIA CA
2016-09-21 657-346-0XXX 0000–0999Assigned AT&T ENTERPRISES, LLC 516C SANTA ANA CA
2016-09-21 657-346-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA

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.