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
2010-06-16 657-549-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ANAHEIM CA
2010-06-15 657-203-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HUNTITNBCH CA
2010-06-09 657-200-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E WESTMINSTR CA
2010-06-09 657-204-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH CA
2010-06-09 657-204-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH CA
2010-06-09 657-204-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH CA
2010-06-09 657-206-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GARDEN GRV CA
2010-06-09 657-206-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E GARDEN GRV CA
2010-06-09 657-549-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANAHEIM CA
2010-06-09 657-549-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANAHEIM CA
2010-06-08 657-205-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2010-06-08 657-205-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2010-06-08 657-205-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2010-06-08 657-205-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2010-06-08 657-205-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2010-06-08 657-205-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2010-06-04 657-269-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SANTA ANA CA
2010-05-25 657-203-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HUNTITNBCH CA
2010-05-18 657-206-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 GARDEN GRV CA
2010-05-14 657-549-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANAHEIM CA
2010-05-06 657-205-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SANTA ANA CA
2010-05-06 657-205-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SANTA ANA CA
2010-05-06 657-205-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SANTA ANA CA
2010-05-03 657-203-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HUNTITNBCH CA
2010-04-26 657-203-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 HUNTITNBCH CA
2010-04-14 657-203-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HUNTITNBCH CA
2010-04-14 657-204-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH CA
2010-04-07 657-464-6XXX 6000–6999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 HUNTITNBCH CA
2010-04-05 657-464-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH CA
2010-03-31 657-269-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J SANTA ANA CA
2010-03-11 657-229-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SANTA ANA CA
2010-03-11 657-229-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SANTA ANA CA
2010-03-11 657-229-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SANTA ANA CA
2010-03-10 657-269-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2010-03-10 657-269-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2010-03-10 657-269-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2010-03-10 657-269-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2010-02-24 657-200-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 WESTMINSTR CA
2010-02-23 657-229-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2010-02-23 657-229-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2010-02-23 657-229-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2010-02-23 657-229-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2010-02-23 657-229-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2010-02-23 657-229-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2010-02-23 657-549-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANAHEIM CA
2010-02-23 657-549-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANAHEIM CA
2010-02-23 657-549-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANAHEIM CA
2010-02-11 657-200-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J WESTMINSTR CA
2010-02-02 657-464-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH CA
2010-01-29 657-200-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E 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.