NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 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 323
ONVOY, 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
2012-09-07 323-473-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 02 CA
2012-09-04 323-406-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 05 CA
2012-09-04 323-406-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 05 CA
2012-09-04 323-657-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 08 CA
2012-09-04 323-657-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 08 CA
2012-09-04 323-657-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 08 CA
2012-08-16 323-342-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C LSAN DA 04 CA
2012-08-16 323-396-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C LSAN DA 14 CA
2012-08-16 323-438-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C LSAN DA 06 CA
2012-08-16 323-452-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C LSAN DA 13 CA
2012-08-13 323-402-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 11 CA
2012-08-13 323-480-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2012-08-13 323-480-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2012-08-13 323-480-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2012-08-13 323-480-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2012-08-13 323-709-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 11 CA
2012-08-08 323-477-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2012-08-08 323-477-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2012-07-30 323-477-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K MONTEBELLO CA
2012-07-20 323-274-4XXX 4000–4999Assigned TWC IP ENABLED SERVICES, LLC 793K LSAN DA 03 CA
2012-07-20 323-407-6XXX 6000–6999Assigned TWC IP ENABLED SERVICES, LLC 793K LSAN DA 02 CA
2012-07-13 323-477-5XXX 5000–5999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2012-07-13 323-477-6XXX 6000–6999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2012-07-13 323-477-7XXX 7000–7999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2012-07-13 323-477-8XXX 8000–8999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2012-07-13 323-477-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2012-07-09 323-346-2XXX 2000–2999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2012-07-09 323-346-3XXX 3000–3999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2012-07-09 323-427-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2012-06-15 323-522-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C LSAN DA 02 CA
2012-05-30 323-452-9XXX 9000–9999Assigned TWC IP ENABLED SERVICES, LLC 793K LSAN DA 13 CA
2012-05-29 323-380-6XXX 6000–6999Assigned TWC IP ENABLED SERVICES, LLC 793K LSAN DA 14 CA
2012-05-21 323-516-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2012-05-10 323-329-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 12 CA
2012-05-10 323-784-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 13 CA
2012-05-10 323-989-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 11 CA
2012-05-10 323-989-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 11 CA
2012-05-10 323-989-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 11 CA
2012-05-10 323-989-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 11 CA
2012-05-07 323-346-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2012-05-07 323-346-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2012-05-07 323-427-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2012-05-07 323-427-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2012-05-07 323-629-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2012-04-27 323-380-5XXX 5000–5999Assigned TWC IP ENABLED SERVICES, LLC 793K LSAN DA 14 CA
2012-04-17 323-416-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F MONTEBELLO CA
2012-04-17 323-416-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F MONTEBELLO CA
2012-04-17 323-416-2XXX 2000–2999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F MONTEBELLO CA
2012-04-17 323-416-3XXX 3000–3999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F MONTEBELLO CA
2012-04-17 323-416-4XXX 4000–4999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F MONTEBELLO 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.