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
2014-01-10 323-703-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 14 CA
2014-01-09 323-714-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2014-01-07 323-536-0XXX 0000–0999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2014-01-07 323-591-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 LSAN DA 13 CA
2013-12-19 323-457-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 06 CA
2013-12-17 323-515-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 08 CA
2013-12-13 323-484-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C LSAN DA 06 CA
2013-12-13 323-536-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LSAN DA 14 CA
2013-12-13 323-673-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 03 CA
2013-12-13 323-673-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 03 CA
2013-12-13 323-909-3XXX 3000–3999Assigned IP HORIZON LLC 515J LSAN DA 04 CA
2013-12-12 323-484-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 06 CA
2013-12-12 323-484-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 06 CA
2013-12-12 323-484-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 06 CA
2013-12-12 323-484-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 06 CA
2013-12-12 323-484-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 06 CA
2013-12-12 323-484-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 06 CA
2013-12-12 323-484-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 06 CA
2013-12-12 323-484-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 06 CA
2013-12-12 323-601-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 12 CA
2013-12-12 323-642-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 12 CA
2013-12-12 323-714-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MONTEBELLO CA
2013-12-12 323-714-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MONTEBELLO CA
2013-12-12 323-714-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MONTEBELLO CA
2013-12-12 323-999-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 03 CA
2013-12-11 323-489-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 02 CA
2013-12-11 323-948-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 05 CA
2013-12-11 323-987-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 04 CA
2013-12-09 323-489-1XXX 1000–1999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 02 CA
2013-12-09 323-489-2XXX 2000–2999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 02 CA
2013-11-06 323-302-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 13 CA
2013-11-06 323-591-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C LSAN DA 13 CA
2013-11-06 323-747-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 03 CA
2013-11-06 323-784-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C LSAN DA 13 CA
2013-11-05 323-307-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C LSAN DA 05 CA
2013-10-31 323-487-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LSAN DA 06 CA
2013-10-30 323-487-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C LSAN DA 06 CA
2013-10-30 323-487-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C LSAN DA 06 CA
2013-10-30 323-536-4XXX 4000–4999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2013-10-30 323-536-5XXX 5000–5999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2013-10-15 323-531-0XXX 0000–0999Assigned TWC IP ENABLED SERVICES, LLC 793K LSAN DA 09 CA
2013-10-15 323-531-1XXX 1000–1999Assigned TWC IP ENABLED SERVICES, LLC 793K LSAN DA 09 CA
2013-10-09 323-389-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C LSAN DA 12 CA
2013-10-07 323-892-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 03 CA
2013-10-04 323-489-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 02 CA
2013-10-04 323-714-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2013-10-04 323-714-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2013-10-01 323-283-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 04 CA
2013-10-01 323-325-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 08 CA
2013-10-01 323-332-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 04 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.