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
2013-05-08 657-221-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2013-05-08 657-221-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2013-04-29 657-218-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SANTA ANA CA
2013-04-29 657-221-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J ORANGE CA
2013-04-08 657-667-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GARDEN GRV CA
2013-04-08 657-667-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GARDEN GRV CA
2013-04-08 657-667-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GARDEN GRV CA
2013-04-03 657-900-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2013-03-19 657-218-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SANTA ANA CA
2013-03-19 657-218-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SANTA ANA CA
2013-03-19 657-400-9XXX 9000–9999Assigned TWC IP ENABLED SERVICES, LLC 793K WESTMINSTR CA
2013-03-19 657-444-8XXX 8000–8999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F PLACENTIA CA
2013-03-19 657-667-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F GARDEN GRV CA
2013-03-19 657-667-8XXX 8000–8999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F GARDEN GRV CA
2013-03-15 657-667-0XXX 0000–0999Assigned TWC IP ENABLED SERVICES, LLC 793K GARDEN GRV CA
2013-03-13 657-444-9XXX 9000–9999Assigned TWC IP ENABLED SERVICES, LLC 793K PLACENTIA CA
2013-03-12 657-214-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C CYPRESS CA
2013-03-12 657-214-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C CYPRESS CA
2013-03-12 657-221-0XXX 0000–0999Assigned TWC IP ENABLED SERVICES, LLC 793K ORANGE CA
2013-03-12 657-378-9XXX 9000–9999Assigned TWC IP ENABLED SERVICES, LLC 793K FULLERTON CA
2013-03-12 657-845-4XXX 4000–4999Assigned TWC IP ENABLED SERVICES, LLC 793K HUNTITNBCH CA
2013-03-05 657-222-8XXX 8000–8999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CYPRESS CA
2013-03-05 657-222-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CYPRESS CA
2013-03-05 657-500-2XXX 2000–2999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FULLERTON CA
2013-03-05 657-500-3XXX 3000–3999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FULLERTON CA
2013-02-27 657-221-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C ORANGE CA
2013-02-27 657-400-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C WESTMINSTR CA
2013-02-26 657-800-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J GARDEN GRV CA
2013-02-14 657-218-4XXX 4000–4999Assigned TWC IP ENABLED SERVICES, LLC 793K SANTA ANA CA
2013-02-14 657-220-4XXX 4000–4999Assigned TWC IP ENABLED SERVICES, LLC 793K ANAHEIM CA
2013-02-11 657-221-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ORANGE CA
2013-01-30 657-400-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WESTMINSTR CA
2013-01-29 657-224-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ORANGE CA
2013-01-24 657-529-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BUENA PARK CA
2013-01-24 657-529-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BUENA PARK CA
2013-01-16 657-900-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SANTA ANA CA
2012-12-31 657-600-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2012-12-31 657-900-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2012-12-04 657-214-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C CYPRESS CA
2012-12-04 657-214-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C CYPRESS CA
2012-12-04 657-214-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C CYPRESS CA
2012-12-04 657-216-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C PLACENTIA CA
2012-12-04 657-216-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C PLACENTIA CA
2012-12-04 657-378-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C FULLERTON CA
2012-12-04 657-378-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C FULLERTON CA
2012-11-16 657-900-2XXX 2000–2999Assigned TWC IP ENABLED SERVICES, LLC 793K SANTA ANA CA
2012-11-08 657-201-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ANAHEIM CA
2012-11-02 657-900-1XXX 1000–1999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SANTA ANA CA
2012-10-17 657-529-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BUENA PARK CA
2012-10-02 657-224-5XXX 5000–5999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F ORANGE 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.