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
2018-10-11 657-340-8XXX 8000–8999Assigned METROPCS NETWORKS, LLC 899D WESTMINSTR CA
2018-10-11 657-900-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D SANTA ANA CA
2018-10-08 657-319-7XXX 7000–7999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FULLERTON CA
2018-10-08 657-360-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HUNTITNBCH CA
2018-10-08 657-365-4XXX 4000–4999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F HUNTITNBCH CA
2018-10-08 657-456-7XXX 7000–7999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F ANAHEIM CA
2018-10-04 657-357-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2018-10-04 657-357-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2018-10-04 657-364-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 WESTMINSTR CA
2018-10-02 657-347-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 ANAHEIM CA
2018-10-02 657-347-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 ANAHEIM CA
2018-10-02 657-348-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 ORANGE CA
2018-10-02 657-348-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 ORANGE CA
2018-10-02 657-357-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SANTA ANA CA
2018-10-02 657-357-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SANTA ANA CA
2018-09-28 657-317-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SILVERADO CA
2018-09-25 657-252-5XXX 5000–5999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BUENA PARK CA
2018-09-25 657-315-7XXX 7000–7999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F PLACENTIA CA
2018-09-25 657-352-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WESTMINSTR CA
2018-09-25 657-366-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2018-09-25 657-366-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2018-09-18 657-365-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HUNTITNBCH CA
2018-09-11 657-360-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-09-11 657-360-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-09-11 657-360-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-09-11 657-360-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-09-11 657-360-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-09-11 657-360-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-09-11 657-360-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-09-11 657-360-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-09-11 657-360-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-09-07 657-339-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-09-07 657-339-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-08-30 657-722-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 GARDEN GRV CA
2018-08-29 657-276-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ANAHEIM CA
2018-08-28 657-261-0XXX 0000–0999Assigned METROPCS NETWORKS, LLC 899D SANTA ANA CA
2018-08-28 657-357-1XXX 1000–1999Assigned METROPCS NETWORKS, LLC 899D SANTA ANA CA
2018-08-28 657-357-8XXX 8000–8999Assigned METROPCS NETWORKS, LLC 899D SANTA ANA CA
2018-08-28 657-357-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D SANTA ANA CA
2018-08-23 657-319-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FULLERTON CA
2018-08-06 657-342-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 HUNTITNBCH CA
2018-08-02 657-352-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-08-02 657-352-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-08-02 657-352-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-08-02 657-352-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-08-02 657-441-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-08-02 657-441-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 WESTMINSTR CA
2018-08-02 657-441-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-08-02 657-441-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-08-02 657-441-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR 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.