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
2016-06-17 657-335-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2016-06-17 657-335-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2016-06-17 657-335-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2016-06-17 657-335-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2016-06-17 657-337-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CYPRESS CA
2016-06-15 657-267-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2016-06-15 657-329-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HUNTITNBCH CA
2016-06-10 657-334-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 WESTMINSTR CA
2016-06-10 657-334-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 WESTMINSTR CA
2016-05-27 657-387-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 YORBALINDA CA
2016-05-26 657-328-9XXX 9000–9999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SANTA ANA CA
2016-05-24 657-328-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-05-24 657-328-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-05-24 657-328-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-05-24 657-328-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-05-24 657-328-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-05-24 657-328-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-05-24 657-328-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-05-20 657-267-0XXX 0000–0999Assigned TWC IP ENABLED SERVICES, LLC 793K SANTA ANA CA
2016-05-19 657-328-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 SANTA ANA CA
2016-05-18 657-387-3XXX 3000–3999Assigned HD CARRIER LLC 321J YORBALINDA CA
2016-05-18 657-387-4XXX 4000–4999Assigned HD CARRIER LLC 321J YORBALINDA CA
2016-05-17 657-332-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C SILVERADO CA
2016-05-17 657-445-6XXX 6000–6999Assigned TWC IP ENABLED SERVICES, LLC 793K FULLERTON CA
2016-05-16 657-276-2XXX 2000–2999Assigned TWC IP ENABLED SERVICES, LLC 793K ANAHEIM CA
2016-05-16 657-281-2XXX 2000–2999Assigned TWC IP ENABLED SERVICES, LLC 793K ORANGE CA
2016-05-16 657-327-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2016-05-16 657-327-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2016-05-16 657-327-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2016-05-16 657-327-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2016-05-16 657-327-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2016-05-16 657-327-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2016-05-16 657-327-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2016-05-16 657-328-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 SANTA ANA CA
2016-05-16 657-329-0XXX 0000–0999Assigned TWC IP ENABLED SERVICES, LLC 793K HUNTITNBCH CA
2016-05-16 657-329-1XXX 1000–1999Assigned TWC IP ENABLED SERVICES, LLC 793K HUNTITNBCH CA
2016-05-09 657-284-8XXX 8000–8999Assigned HD CARRIER LLC 321J ORANGE CA
2016-05-09 657-390-2XXX 2000–2999Assigned HD CARRIER LLC 321J ORANGE CA
2016-05-09 657-390-4XXX 4000–4999Assigned HD CARRIER LLC 321J ORANGE CA
2016-05-09 657-390-7XXX 7000–7999Assigned HD CARRIER LLC 321J ORANGE CA
2016-05-09 657-390-8XXX 8000–8999Assigned HD CARRIER LLC 321J ORANGE CA
2016-05-06 657-293-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-05-06 657-293-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-05-06 657-293-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-05-06 657-293-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-05-06 657-318-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WESTMINSTR CA
2016-05-06 657-318-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-05-06 657-318-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-05-06 657-318-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-05-06 657-318-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 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.