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
2016-08-10 657-331-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ANAHEIM CA
2016-08-10 657-341-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BREA CA
2016-08-10 657-341-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BREA CA
2016-08-10 657-341-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BREA CA
2016-08-10 657-341-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BREA CA
2016-08-09 657-325-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BUENA PARK CA
2016-08-09 657-342-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 HUNTITNBCH CA
2016-08-09 657-342-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HUNTITNBCH CA
2016-08-03 657-281-3XXX 3000–3999Assigned HD CARRIER LLC 321J ORANGE CA
2016-08-03 657-281-6XXX 6000–6999Assigned HD CARRIER LLC 321J ORANGE CA
2016-08-03 657-387-6XXX 6000–6999Assigned HD CARRIER LLC 321J YORBALINDA CA
2016-07-21 657-387-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2016-07-19 657-284-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2016-07-19 657-291-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2016-07-19 657-291-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2016-07-19 657-291-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2016-07-19 657-334-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E WESTMINSTR CA
2016-07-19 657-335-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
2016-07-15 657-445-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C FULLERTON CA
2016-07-14 657-338-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2016-07-14 657-338-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2016-07-14 657-338-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2016-07-14 657-338-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2016-07-14 657-338-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2016-07-14 657-338-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2016-07-14 657-338-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2016-07-13 657-341-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C BREA CA
2016-07-13 657-341-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C BREA CA
2016-07-05 657-387-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2016-07-01 657-341-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BREA CA
2016-07-01 657-341-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BREA CA
2016-06-29 657-275-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E PLACENTIA CA
2016-06-29 657-325-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BUENA PARK CA
2016-06-28 657-284-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J ORANGE CA
2016-06-24 657-253-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FULLERTON CA
2016-06-24 657-276-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 ANAHEIM CA
2016-06-24 657-295-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ANAHEIM CA
2016-06-24 657-331-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 ANAHEIM CA
2016-06-24 657-331-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 ANAHEIM CA
2016-06-24 657-337-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CYPRESS CA
2016-06-24 657-377-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 GARDEN GRV CA
2016-06-24 657-377-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 GARDEN GRV CA
2016-06-23 657-337-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CYPRESS CA
2016-06-22 657-281-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2016-06-22 657-281-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2016-06-22 657-332-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C SILVERADO CA
2016-06-22 657-332-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C SILVERADO CA
2016-06-22 657-387-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C YORBALINDA CA
2016-06-20 657-334-7XXX 7000–7999Assigned TWC IP ENABLED SERVICES, LLC 793K WESTMINSTR CA
2016-06-17 657-335-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SANTA ANA 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.