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
2017-10-13 323-328-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LSAN DA 11 CA
2017-09-21 323-305-6XXX 6000–6999Assigned TWC IP ENABLED SERVICES, LLC 793K LSAN DA 09 CA
2017-09-21 323-818-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 03 CA
2017-09-21 323-840-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 11 CA
2017-09-21 323-840-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 11 CA
2017-09-21 323-853-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MONTEBELLO CA
2017-09-20 323-330-3XXX 3000–3999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 13 CA
2017-09-20 323-381-4XXX 4000–4999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 13 CA
2017-09-20 323-579-6XXX 6000–6999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 02 CA
2017-09-20 323-579-7XXX 7000–7999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 02 CA
2017-09-20 323-628-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2017-09-20 323-677-7XXX 7000–7999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 13 CA
2017-09-20 323-761-4XXX 4000–4999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 13 CA
2017-09-20 323-801-3XXX 3000–3999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 13 CA
2017-09-20 323-978-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2017-09-14 323-446-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LSAN DA 05 CA
2017-09-07 323-914-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 MONTEBELLO CA
2017-09-07 323-914-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 MONTEBELLO CA
2017-08-29 323-761-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 13 CA
2017-08-29 323-880-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 09 CA
2017-08-29 323-880-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 09 CA
2017-08-29 323-940-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 04 CA
2017-08-22 323-968-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C LSAN DA 05 CA
2017-08-22 323-968-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C LSAN DA 05 CA
2017-08-22 323-968-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C LSAN DA 05 CA
2017-08-22 323-968-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C LSAN DA 05 CA
2017-08-09 323-918-2XXX 2000–2999Assigned TWC IP ENABLED SERVICES, LLC 793K LSAN DA 08 CA
2017-08-09 323-968-1XXX 1000–1999Assigned TWC IP ENABLED SERVICES, LLC 793K LSAN DA 05 CA
2017-08-08 323-628-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 14 CA
2017-08-08 323-914-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MONTEBELLO CA
2017-08-08 323-914-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MONTEBELLO CA
2017-08-08 323-914-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MONTEBELLO CA
2017-08-08 323-914-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MONTEBELLO CA
2017-08-08 323-914-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MONTEBELLO CA
2017-08-07 323-818-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2017-08-07 323-818-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2017-08-07 323-818-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2017-07-28 323-403-2XXX 2000–2999Assigned TWC IP ENABLED SERVICES, LLC 793K LSAN DA 12 CA
2017-07-28 323-880-5XXX 5000–5999Assigned TWC IP ENABLED SERVICES, LLC 793K LSAN DA 09 CA
2017-07-27 323-852-2XXX 2000–2999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 13 CA
2017-07-27 323-879-1XXX 1000–1999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 13 CA
2017-07-27 323-879-2XXX 2000–2999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 13 CA
2017-07-26 323-408-3XXX 3000–3999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2017-07-26 323-408-4XXX 4000–4999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2017-07-26 323-408-5XXX 5000–5999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2017-07-26 323-408-6XXX 6000–6999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2017-07-26 323-408-7XXX 7000–7999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2017-07-26 323-446-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 LSAN DA 05 CA
2017-07-19 323-579-3XXX 3000–3999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 02 CA
2017-07-19 323-579-4XXX 4000–4999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 02 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.