NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

37 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 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
2012-10-02 657-224-6XXX 6000–6999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F ORANGE CA
2012-09-12 657-400-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E WESTMINSTR CA
2012-09-12 657-400-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E WESTMINSTR CA
2012-09-12 657-400-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E WESTMINSTR CA
2012-09-07 657-900-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J SANTA ANA CA
2012-08-30 657-529-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 BUENA PARK CA
2012-08-24 657-529-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BUENA PARK CA
2012-08-24 657-529-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BUENA PARK CA
2012-08-23 657-777-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CYPRESS CA
2012-08-23 657-777-5XXX 5000–5999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CYPRESS CA
2012-08-23 657-777-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CYPRESS CA
2012-08-16 657-216-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C PLACENTIA CA
2012-08-16 657-224-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C ORANGE CA
2012-08-09 657-224-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2012-08-09 657-224-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2012-08-09 657-224-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2012-07-31 657-400-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 WESTMINSTR CA
2012-07-30 657-214-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 CYPRESS CA
2012-07-30 657-378-5XXX 5000–5999Assigned METROPCS NETWORKS, LLC 899D FULLERTON CA
2012-07-09 657-400-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J WESTMINSTR CA
2012-06-21 657-224-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C ORANGE CA
2012-06-20 657-216-4XXX 4000–4999Assigned METROPCS NETWORKS, LLC 899D PLACENTIA CA
2012-06-06 657-300-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C HUNTITNBCH CA
2012-06-06 657-300-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C HUNTITNBCH CA
2012-06-06 657-300-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C HUNTITNBCH CA
2012-06-06 657-300-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C HUNTITNBCH CA
2012-06-06 657-300-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C HUNTITNBCH CA
2012-06-06 657-300-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C HUNTITNBCH CA
2012-06-06 657-300-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C HUNTITNBCH CA
2012-06-06 657-300-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C HUNTITNBCH CA
2012-06-06 657-800-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C GARDEN GRV CA
2012-06-06 657-800-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C GARDEN GRV CA
2012-06-06 657-800-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C GARDEN GRV CA
2012-06-06 657-800-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C GARDEN GRV CA
2012-06-06 657-800-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C GARDEN GRV CA
2012-06-06 657-800-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C GARDEN GRV CA
2012-05-29 657-201-3XXX 3000–3999Assigned TWC IP ENABLED SERVICES, LLC 793K ANAHEIM CA
2012-05-23 657-999-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ANAHEIM CA
2012-05-22 657-600-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SANTA ANA CA
2012-04-27 657-600-8XXX 8000–8999Assigned TWC IP ENABLED SERVICES, LLC 793K SANTA ANA CA
2012-04-25 657-217-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 FULLERTON CA
2012-04-24 657-529-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BUENA PARK CA
2012-04-17 657-600-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SANTA ANA CA
2012-04-16 657-225-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FULLERTON CA
2012-04-16 657-225-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FULLERTON CA
2012-04-16 657-225-2XXX 2000–2999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FULLERTON CA
2012-04-16 657-225-3XXX 3000–3999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FULLERTON CA
2012-04-16 657-225-4XXX 4000–4999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FULLERTON CA
2012-04-16 657-225-5XXX 5000–5999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FULLERTON CA
2012-04-16 657-225-6XXX 6000–6999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FULLERTON 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.