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
2016-05-06 657-390-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ORANGE CA
2016-05-02 657-276-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ANAHEIM CA
2016-04-28 657-246-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BREA CA
2016-04-21 657-325-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C BUENA PARK CA
2016-04-21 657-325-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C BUENA PARK CA
2016-04-11 657-316-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-04-11 657-316-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-04-11 657-316-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-04-11 657-316-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-04-11 657-316-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-04-11 657-316-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-04-11 657-316-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-04-11 657-316-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-04-11 657-316-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-04-11 657-316-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-04-11 657-318-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-04-11 657-318-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-04-11 657-318-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-04-11 657-318-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2016-04-07 657-276-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ANAHEIM CA
2016-04-07 657-390-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ORANGE CA
2016-04-05 657-312-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C HUNTITNBCH CA
2016-04-05 657-312-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C HUNTITNBCH CA
2016-03-30 657-297-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-03-30 657-297-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2016-03-30 657-313-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-03-30 657-313-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-03-30 657-377-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 GARDEN GRV CA
2016-03-30 657-377-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 GARDEN GRV CA
2016-03-24 657-377-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C GARDEN GRV CA
2016-03-24 657-377-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C GARDEN GRV CA
2016-03-23 657-272-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C ANAHEIM CA
2016-03-23 657-272-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C ANAHEIM CA
2016-03-23 657-295-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C ANAHEIM CA
2016-03-23 657-298-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C CYPRESS CA
2016-03-22 657-255-9XXX 9000–9999Assigned PAETEC ITEL, LLC 829J BUENA PARK CA
2016-03-22 657-313-2XXX 2000–2999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SANTA ANA CA
2016-03-22 657-377-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C GARDEN GRV CA
2016-03-22 657-377-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C GARDEN GRV CA
2016-03-18 657-306-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C WESTMINSTR CA
2016-03-18 657-306-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C WESTMINSTR CA
2016-03-16 657-308-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-03-16 657-308-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-03-16 657-308-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-03-16 657-308-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-03-16 657-308-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-03-16 657-308-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-03-16 657-308-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-03-16 657-308-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2016-03-16 657-308-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 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.