NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

31 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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
2018-04-06 657-339-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-04-06 657-339-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-04-06 657-342-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-04-06 657-342-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-04-06 657-355-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-04-06 657-355-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-04-06 657-355-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-04-06 657-355-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2018-04-06 657-356-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C SANTA ANA CA
2018-04-06 657-356-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C SANTA ANA CA
2018-04-04 657-310-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SILVERADO CA
2018-03-29 657-319-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D FULLERTON CA
2018-03-28 657-340-7XXX 7000–7999Assigned METROPCS NETWORKS, LLC 899D WESTMINSTR CA
2018-03-27 657-354-5XXX 5000–5999Assigned METROPCS NETWORKS, LLC 899D FULLERTON CA
2018-03-27 657-354-6XXX 6000–6999Assigned METROPCS NETWORKS, LLC 899D FULLERTON CA
2018-03-14 657-522-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2018-03-14 657-522-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2018-03-14 657-522-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2018-03-14 657-522-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2018-03-14 657-522-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2018-03-14 657-522-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2018-03-14 657-522-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2018-03-14 657-522-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2018-03-13 657-310-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-03-13 657-310-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-03-13 657-310-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-03-13 657-310-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2018-03-07 657-345-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2018-03-07 657-345-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2018-02-09 657-315-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PLACENTIA CA
2018-02-09 657-352-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WESTMINSTR CA
2017-12-20 657-213-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C CYPRESS CA
2017-12-20 657-213-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C CYPRESS CA
2017-12-14 657-355-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HUNTITNBCH CA
2017-12-11 657-347-1XXX 1000–1999Assigned TWC IP ENABLED SERVICES, LLC 793K ANAHEIM CA
2017-12-08 657-356-1XXX 1000–1999Assigned TWC IP ENABLED SERVICES, LLC 793K SANTA ANA CA
2017-11-27 657-441-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C WESTMINSTR CA
2017-11-27 657-441-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C WESTMINSTR CA
2017-11-10 657-329-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C HUNTITNBCH CA
2017-11-10 657-329-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C HUNTITNBCH CA
2017-11-06 657-329-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HUNTITNBCH CA
2017-11-06 657-345-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 YORBALINDA CA
2017-11-02 657-325-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 BUENA PARK CA
2017-10-25 657-345-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J YORBALINDA CA
2017-10-25 657-478-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BREA CA
2017-10-19 657-348-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C ORANGE CA
2017-10-19 657-390-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C ORANGE CA
2017-10-19 657-390-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C ORANGE CA
2017-10-06 657-720-6XXX 6000–6999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SANTA ANA CA
2017-10-03 657-314-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SILVERADO CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.