NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

31 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 30
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
2018-08-02 657-441-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-08-02 657-441-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2018-07-31 657-359-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-07-31 657-359-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-07-31 657-359-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-07-31 657-359-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-07-31 657-359-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-07-31 657-359-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-07-31 657-359-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-07-31 657-359-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-07-19 657-342-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-07-19 657-355-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-07-19 657-355-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-07-19 657-355-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-07-19 657-355-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-06-28 657-352-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WESTMINSTR CA
2018-06-27 657-337-7XXX 7000–7999Assigned TELNYX LLC 073H CYPRESS CA
2018-06-27 657-359-9XXX 9000–9999Assigned TELNYX LLC 073H SILVERADO CA
2018-06-27 657-478-7XXX 7000–7999Assigned TELNYX LLC 073H BREA CA
2018-06-15 657-234-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2018-06-15 657-363-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2018-06-13 657-359-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SILVERADO CA
2018-05-29 657-242-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 ANAHEIM CA
2018-05-25 657-254-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ANAHEIM CA
2018-05-07 657-354-4XXX 4000–4999Assigned METROPCS NETWORKS, LLC 899D FULLERTON CA
2018-05-04 657-319-0XXX 0000–0999Assigned INTEGRATED PATH COMMUNICATIONS, LLC - CA 707H FULLERTON CA
2018-05-04 657-522-9XXX 9000–9999Assigned INTEGRATED PATH COMMUNICATIONS, LLC - CA 707H YORBALINDA CA
2018-05-04 657-722-3XXX 3000–3999Assigned INTEGRATED PATH COMMUNICATIONS, LLC - CA 707H GARDEN GRV CA
2018-04-26 657-213-5XXX 5000–5999Assigned INTEGRATED PATH COMMUNICATIONS, LLC - CA 707H CYPRESS CA
2018-04-26 657-315-5XXX 5000–5999Assigned INTEGRATED PATH COMMUNICATIONS, LLC - CA 707H PLACENTIA CA
2018-04-26 657-342-3XXX 3000–3999Assigned INTEGRATED PATH COMMUNICATIONS, LLC - CA 707H HUNTITNBCH CA
2018-04-26 657-441-5XXX 5000–5999Assigned INTEGRATED PATH COMMUNICATIONS, LLC - CA 707H WESTMINSTR CA
2018-04-26 657-478-4XXX 4000–4999Assigned INTEGRATED PATH COMMUNICATIONS, LLC - CA 707H BREA CA
2018-04-23 657-310-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-04-23 657-310-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-04-23 657-310-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-04-23 657-314-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-04-23 657-314-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-04-12 657-320-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 ORANGE CA
2018-04-12 657-320-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 ORANGE CA
2018-04-12 657-320-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 ORANGE CA
2018-04-12 657-320-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 ORANGE CA
2018-04-12 657-320-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 ORANGE CA
2018-04-12 657-320-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 ORANGE CA
2018-04-12 657-320-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 ORANGE CA
2018-04-12 657-320-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 ORANGE CA
2018-04-12 657-320-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 ORANGE CA
2018-04-12 657-320-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 ORANGE CA
2018-04-11 657-315-8XXX 8000–8999Assigned METROPCS NETWORKS, LLC 899D PLACENTIA CA
2018-04-06 657-329-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 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.