NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

1 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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
2006-06-12 323-790-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LSAN DA 14 CA
2006-06-09 323-406-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C LSAN DA 05 CA
2006-06-09 323-476-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C LSAN DA 06 CA
2006-06-09 323-505-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C LSAN DA 04 CA
2006-06-08 323-877-4XXX 4000–4999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2006-06-08 323-898-3XXX 3000–3999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2006-06-07 323-419-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 11 CA
2006-06-05 323-599-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2006-06-05 323-599-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2006-06-01 323-274-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2006-06-01 323-982-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2006-05-26 323-742-4XXX 4000–4999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2006-05-26 323-742-5XXX 5000–5999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2006-05-26 323-742-6XXX 6000–6999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2006-05-24 323-352-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LSAN DA 04 CA
2006-05-24 323-405-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LSAN DA 04 CA
2006-05-17 323-638-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 06 CA
2006-05-16 323-300-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 02 CA
2006-05-16 323-300-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 02 CA
2006-05-16 323-767-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MONTEBELLO CA
2006-05-16 323-879-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C LSAN DA 13 CA
2006-05-15 323-762-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LSAN DA 14 CA
2006-05-12 323-335-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 LSAN DA 02 CA
2006-05-12 323-362-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 LSAN DA 05 CA
2006-05-12 323-516-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MONTEBELLO CA
2006-05-12 323-539-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 LSAN DA 04 CA
2006-05-12 323-545-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 LSAN DA 12 CA
2006-05-12 323-549-8XXX 8000–8999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 LSAN DA 13 CA
2006-05-12 323-684-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 LSAN DA 03 CA
2006-05-12 323-836-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 LSAN DA 14 CA
2006-05-12 323-843-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 LSAN DA 05 CA
2006-05-12 323-973-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 LSAN DA 06 CA
2006-05-12 323-989-8XXX 8000–8999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 LSAN DA 11 CA
2006-05-09 323-474-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2006-05-09 323-474-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2006-05-09 323-599-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LSAN DA 09 CA
2006-05-09 323-599-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LSAN DA 09 CA
2006-05-05 323-698-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LSAN DA 14 CA
2006-05-05 323-698-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LSAN DA 14 CA
2006-05-05 323-698-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LSAN DA 14 CA
2006-05-05 323-698-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LSAN DA 14 CA
2006-05-05 323-698-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LSAN DA 14 CA
2006-05-03 323-329-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LSAN DA 12 CA
2006-04-27 323-742-7XXX 7000–7999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2006-04-27 323-742-8XXX 8000–8999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2006-04-27 323-742-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2006-04-24 323-681-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2006-04-24 323-681-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2006-04-24 323-681-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2006-04-24 323-681-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.