NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

31 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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
2019-01-23 657-315-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 PLACENTIA CA
2019-01-22 657-369-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2019-01-22 657-369-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2019-01-22 657-369-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2019-01-22 657-369-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2019-01-22 657-369-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2019-01-22 657-369-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2019-01-22 657-369-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2019-01-22 657-369-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2019-01-22 657-369-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2019-01-22 657-369-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2019-01-17 657-357-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2019-01-11 657-267-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D SANTA ANA CA
2019-01-11 657-356-4XXX 4000–4999Assigned METROPCS NETWORKS, LLC 899D SANTA ANA CA
2019-01-04 657-478-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BREA CA
2018-12-24 657-336-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2018-12-24 657-356-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2018-12-24 657-356-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2018-12-24 657-358-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2018-12-24 657-368-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-12-24 657-368-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-12-24 657-368-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-12-24 657-368-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-12-24 657-368-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-12-24 657-368-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-12-24 657-900-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2018-12-07 657-319-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 FULLERTON CA
2018-12-06 657-368-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WESTMINSTR CA
2018-12-04 657-282-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ORANGE CA
2018-11-26 657-367-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-11-26 657-367-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-11-26 657-367-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-11-26 657-367-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-11-26 657-367-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-11-26 657-367-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-11-26 657-367-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-11-26 657-367-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-11-26 657-367-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-11-26 657-367-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-11-01 657-352-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-11-01 657-364-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-11-01 657-364-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-11-01 657-364-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-11-01 657-364-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-11-01 657-364-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-10-19 657-366-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 YORBALINDA CA
2018-10-19 657-465-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CYPRESS CA
2018-10-18 657-263-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 GARDEN GRV CA
2018-10-18 657-366-2XXX 2000–2999Assigned TELNYX LLC 073H YORBALINDA CA
2018-10-11 657-201-6XXX 6000–6999Assigned METROPCS NETWORKS, LLC 899D ANAHEIM CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.