NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

31 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 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
2017-09-26 657-720-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SANTA ANA CA
2017-09-20 657-364-7XXX 7000–7999Assigned METROPCS NETWORKS, LLC 899D WESTMINSTR CA
2017-09-12 657-364-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WESTMINSTR CA
2017-08-23 657-331-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C ANAHEIM CA
2017-08-23 657-331-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C ANAHEIM CA
2017-08-23 657-331-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C ANAHEIM CA
2017-08-23 657-331-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C ANAHEIM CA
2017-08-17 657-314-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-08-17 657-314-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-08-17 657-314-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-08-17 657-314-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-08-17 657-314-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-08-17 657-314-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-08-11 657-325-4XXX 4000–4999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BUENA PARK CA
2017-08-07 657-358-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2017-08-07 657-358-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2017-08-07 657-720-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2017-08-07 657-720-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2017-08-07 657-720-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SANTA ANA CA
2017-08-01 657-720-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SANTA ANA CA
2017-08-01 657-720-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SANTA ANA CA
2017-08-01 657-720-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SANTA ANA CA
2017-08-01 657-720-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SANTA ANA CA
2017-07-28 657-354-7XXX 7000–7999Assigned TWC IP ENABLED SERVICES, LLC 793K FULLERTON CA
2017-07-27 657-358-8XXX 8000–8999Assigned METROPCS NETWORKS, LLC 899D SANTA ANA CA
2017-07-27 657-358-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D SANTA ANA CA
2017-07-26 657-276-8XXX 8000–8999Assigned METROPCS NETWORKS, LLC 899D ANAHEIM CA
2017-07-24 657-314-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SILVERADO CA
2017-07-19 657-354-8XXX 8000–8999Assigned METROPCS NETWORKS, LLC 899D FULLERTON CA
2017-07-10 657-310-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-06-29 657-358-3XXX 3000–3999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SANTA ANA CA
2017-06-26 657-478-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BREA CA
2017-06-22 657-358-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SANTA ANA CA
2017-06-21 657-296-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 GARDEN GRV CA
2017-06-21 657-325-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BUENA PARK CA
2017-06-15 657-213-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CYPRESS CA
2017-06-13 657-354-3XXX 3000–3999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FULLERTON CA
2017-06-06 657-276-7XXX 7000–7999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F ANAHEIM CA
2017-06-05 657-209-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-06-05 657-209-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-06-05 657-209-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-06-05 657-209-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-06-05 657-209-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-06-05 657-209-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-06-05 657-209-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-06-05 657-209-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-06-05 657-209-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-06-05 657-209-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2017-05-22 657-315-2XXX 2000–2999Assigned TELNYX LLC 073H PLACENTIA CA
2017-05-22 657-329-2XXX 2000–2999Assigned TELNYX LLC 073H HUNTITNBCH 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.