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
2016-01-25 657-290-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-290-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-290-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-290-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-290-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-290-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-290-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-290-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-290-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-322-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-322-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-322-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-322-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-322-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-322-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-322-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-322-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-322-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-25 657-322-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-20 657-387-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C YORBALINDA CA
2016-01-18 657-297-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C SILVERADO CA
2016-01-15 657-287-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-01-15 657-287-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-01-15 657-287-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-01-15 657-287-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-01-15 657-445-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 FULLERTON CA
2016-01-15 657-445-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FULLERTON CA
2016-01-13 657-280-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2016-01-12 657-273-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-12 657-273-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-12 657-273-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-12 657-273-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-12 657-289-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-12 657-289-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-01-08 657-289-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2016-01-08 657-289-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2016-01-08 657-289-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2016-01-07 657-296-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 GARDEN GRV CA
2016-01-07 657-296-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 GARDEN GRV CA
2016-01-07 657-296-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 GARDEN GRV CA
2016-01-04 657-273-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SANTA ANA CA
2015-12-22 657-286-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C BREA CA
2015-12-22 657-286-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C BREA CA
2015-12-22 657-288-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C WESTMINSTR CA
2015-12-22 657-288-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C WESTMINSTR CA
2015-12-22 657-289-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C SANTA ANA CA
2015-12-22 657-289-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SANTA ANA CA
2015-12-22 657-295-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C ANAHEIM CA
2015-12-22 657-295-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C ANAHEIM CA
2015-12-21 657-291-2XXX 2000–2999Assigned TWC IP ENABLED SERVICES, LLC 793K ORANGE 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.