NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

37 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 36
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
2014-06-02 657-238-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CYPRESS CA
2014-05-07 657-237-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HUNTITNBCH CA
2014-04-28 657-238-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CYPRESS CA
2014-04-28 657-242-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ANAHEIM CA
2014-04-23 657-227-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J WESTMINSTR CA
2014-04-14 657-227-8XXX 8000–8999Assigned TWC IP ENABLED SERVICES, LLC 793K WESTMINSTR CA
2014-04-14 657-235-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SANTA ANA CA
2014-04-14 657-269-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SANTA ANA CA
2014-04-11 657-236-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ORANGE CA
2014-04-11 657-236-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ORANGE CA
2014-04-11 657-251-0XXX 0000–0999Assigned TWC IP ENABLED SERVICES, LLC 793K GARDEN GRV CA
2014-04-10 657-220-5XXX 5000–5999Assigned TWC IP ENABLED SERVICES, LLC 793K ANAHEIM CA
2014-04-10 657-231-9XXX 9000–9999Assigned TWC IP ENABLED SERVICES, LLC 793K SANTA ANA CA
2014-04-04 657-220-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ANAHEIM CA
2014-04-03 657-232-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SANTA ANA CA
2014-04-01 657-378-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FULLERTON CA
2014-04-01 657-500-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FULLERTON CA
2014-03-24 657-234-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2014-03-19 657-220-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F ANAHEIM CA
2014-03-18 657-226-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLACENTIA CA
2014-03-03 657-226-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E PLACENTIA CA
2014-03-03 657-226-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E PLACENTIA CA
2014-02-27 657-500-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FULLERTON CA
2014-02-26 657-221-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2014-02-26 657-223-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2014-02-26 657-223-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2014-02-26 657-223-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2014-02-26 657-223-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2014-02-26 657-231-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2014-02-26 657-231-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2014-02-26 657-231-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2014-02-26 657-231-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2014-02-26 657-231-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2014-02-26 657-231-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2014-02-26 657-233-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GARDEN GRV CA
2014-02-26 657-233-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GARDEN GRV CA
2014-02-26 657-233-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GARDEN GRV CA
2014-02-26 657-233-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GARDEN GRV CA
2014-02-26 657-233-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GARDEN GRV CA
2014-02-26 657-233-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GARDEN GRV CA
2014-02-26 657-233-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GARDEN GRV CA
2014-02-26 657-845-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH CA
2014-02-26 657-845-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH CA
2014-02-26 657-845-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH CA
2014-02-26 657-845-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH CA
2014-02-26 657-845-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH CA
2014-02-25 657-231-7XXX 7000–7999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SANTA ANA CA
2014-02-25 657-500-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 FULLERTON CA
2014-02-11 657-233-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 GARDEN GRV CA
2014-02-07 657-220-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ANAHEIM CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.