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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2012-01-25 657-207-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANAHEIM CA
2012-01-25 657-235-6XXX 6000–6999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SANTA ANA CA
2012-01-05 657-210-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2012-01-05 657-235-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2012-01-04 657-235-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SANTA ANA CA
2011-12-13 657-464-2XXX 2000–2999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F HUNTITNBCH CA
2011-12-06 657-212-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SANTA ANA CA
2011-12-06 657-235-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SANTA ANA CA
2011-11-30 657-216-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PLACENTIA CA
2011-11-11 657-217-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FULLERTON CA
2011-11-11 657-217-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FULLERTON CA
2011-11-11 657-217-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FULLERTON CA
2011-11-11 657-217-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FULLERTON CA
2011-11-11 657-999-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANAHEIM CA
2011-11-11 657-999-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANAHEIM CA
2011-11-11 657-999-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANAHEIM CA
2011-11-11 657-999-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANAHEIM CA
2011-09-20 657-444-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C PLACENTIA CA
2011-09-16 657-208-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ANAHEIM CA
2011-09-14 657-208-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANAHEIM CA
2011-09-14 657-217-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FULLERTON CA
2011-09-14 657-235-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2011-09-01 657-217-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C FULLERTON CA
2011-08-22 657-217-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FULLERTON CA
2011-08-22 657-217-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FULLERTON CA
2011-07-27 657-204-9XXX 9000–9999Assigned TWC IP ENABLED SERVICES, LLC 793K HUNTITNBCH CA
2011-07-27 657-235-1XXX 1000–1999Assigned DMR COMMUNICATIONS INC. - CA 478A SANTA ANA CA
2011-07-22 657-217-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FULLERTON CA
2011-07-22 657-235-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2011-07-22 657-666-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E WESTMINSTR CA
2011-07-20 657-333-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2011-07-13 657-216-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J PLACENTIA CA
2011-07-12 657-203-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2011-05-27 657-208-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANAHEIM CA
2011-05-27 657-208-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANAHEIM CA
2011-05-09 657-888-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ORANGE CA
2011-05-04 657-201-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ANAHEIM CA
2011-05-04 657-210-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SANTA ANA CA
2011-05-04 657-210-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SANTA ANA CA
2011-05-04 657-210-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C SANTA ANA CA
2011-05-04 657-999-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ANAHEIM CA
2011-04-27 657-200-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E WESTMINSTR CA
2011-04-27 657-200-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E WESTMINSTR CA
2011-04-27 657-206-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GARDEN GRV CA
2011-04-27 657-206-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GARDEN GRV CA
2011-04-27 657-206-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GARDEN GRV CA
2011-04-27 657-215-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH CA
2011-04-27 657-215-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH CA
2011-04-27 657-215-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH CA
2011-04-27 657-215-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH 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.