NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

12 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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 424
ONVOY, LLC - CA 10
OPENTACT INC. 1
NEW CINGULAR WIRELESS PCS, LLC 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
2017-01-10 424-399-0XXX 0000–0999Assigned METROPCS NETWORKS, LLC 899D TORRANCE CA
2017-01-09 424-421-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BEVERLYHLS CA
2017-01-05 424-541-2XXX 2000–2999Assigned METROPCS NETWORKS, LLC 899D INGLEWOOD CA
2016-12-28 424-423-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 EL SEGUNDO CA
2016-12-28 424-423-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 EL SEGUNDO CA
2016-12-28 424-423-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 EL SEGUNDO CA
2016-12-28 424-423-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 EL SEGUNDO CA
2016-12-19 424-433-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SNMN SNMN CA
2016-12-16 424-414-1XXX 1000–1999Assigned TELNYX LLC 073H INGLEWOOD CA
2016-12-07 424-433-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN SNMN CA
2016-12-06 424-377-3XXX 3000–3999Assigned IP HORIZON LLC 515J AVALON CA
2016-11-30 424-533-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN PEDRO CA
2016-11-21 424-399-5XXX 5000–5999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F TORRANCE CA
2016-11-16 424-421-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C BEVERLYHLS CA
2016-11-16 424-433-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SNMN SNMN CA
2016-11-16 424-433-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C SNMN SNMN CA
2016-11-15 424-403-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CMTN CMTN CA
2016-11-15 424-403-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CMTN CMTN CA
2016-11-14 424-397-2XXX 2000–2999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F EL SEGUNDO CA
2016-11-14 424-421-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BEVERLYHLS CA
2016-11-14 424-523-4XXX 4000–4999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CULVERCITY CA
2016-11-08 424-377-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C AVALON CA
2016-11-08 424-377-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F AVALON CA
2016-11-07 424-397-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 EL SEGUNDO CA
2016-11-02 424-403-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2016-11-01 424-541-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C INGLEWOOD CA
2016-11-01 424-567-1XXX 1000–1999Assigned METROPCS NETWORKS, LLC 899D HAWTHORNE CA
2016-10-24 424-225-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 EL SEGUNDO CA
2016-10-21 424-308-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SAN PEDRO CA
2016-10-21 424-380-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 INGLEWOOD CA
2016-10-21 424-380-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 INGLEWOOD CA
2016-10-21 424-402-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 W ANGELES CA
2016-10-14 424-388-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MALIBU CA
2016-10-05 424-567-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 HAWTHORNE CA
2016-10-05 424-567-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 HAWTHORNE CA
2016-10-04 424-366-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2016-10-04 424-366-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2016-10-04 424-366-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2016-10-04 424-366-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2016-09-30 424-222-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LOMITA CA
2016-09-28 424-397-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C EL SEGUNDO CA
2016-09-26 424-532-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CULVERCITY CA
2016-09-23 424-402-8XXX 8000–8999Assigned TWC IP ENABLED SERVICES, LLC 793K W ANGELES CA
2016-09-22 424-390-4XXX 4000–4999Assigned TWC IP ENABLED SERVICES, LLC 793K REDONDO CA
2016-09-21 424-421-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2016-09-21 424-567-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J HAWTHORNE CA
2016-09-19 424-523-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C CULVERCITY CA
2016-09-19 424-523-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C CULVERCITY CA
2016-09-16 424-313-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2016-09-16 424-389-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.