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
2005-05-12 323-375-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C LSAN DA 02 CA
2005-05-10 323-335-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LSAN DA 02 CA
2005-05-05 323-286-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2005-05-05 323-286-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2005-05-05 323-552-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2005-05-05 323-603-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LSAN DA 14 CA
2005-05-03 323-216-3XXX 3000–3999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2005-05-03 323-216-4XXX 4000–4999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2005-05-03 323-216-5XXX 5000–5999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2005-05-03 323-216-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2005-05-03 323-287-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LSAN DA 04 CA
2005-04-22 323-877-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2005-04-22 323-898-1XXX 1000–1999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2005-04-22 323-898-2XXX 2000–2999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2005-04-20 323-490-2XXX 2000–2999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2005-04-20 323-490-3XXX 3000–3999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2005-04-20 323-490-4XXX 4000–4999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2005-04-20 323-490-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2005-04-20 323-490-6XXX 6000–6999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2005-04-20 323-490-8XXX 8000–8999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2005-04-20 323-867-0XXX 0000–0999Assigned METROPCS NETWORKS, LLC 899D MONTEBELLO CA
2005-04-15 323-419-6XXX 6000–6999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 11 CA
2005-04-14 323-537-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LSAN DA 06 CA
2005-04-14 323-537-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LSAN DA 06 CA
2005-04-14 323-537-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LSAN DA 06 CA
2005-04-14 323-537-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LSAN DA 06 CA
2005-04-14 323-537-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LSAN DA 06 CA
2005-04-14 323-537-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LSAN DA 06 CA
2005-04-13 323-215-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MONTEBELLO CA
2005-04-13 323-215-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MONTEBELLO CA
2005-04-06 323-287-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LSAN DA 04 CA
2005-04-05 323-898-4XXX 4000–4999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2005-04-05 323-898-5XXX 5000–5999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2005-04-05 323-898-6XXX 6000–6999Assigned METROPCS NETWORKS, LLC 899D LSAN DA 14 CA
2005-03-30 323-527-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2005-03-25 323-490-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C MONTEBELLO CA
2005-03-25 323-543-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2005-03-25 323-543-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2005-03-25 323-543-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2005-03-25 323-551-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2005-03-25 323-551-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2005-03-23 323-230-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 08 CA
2005-03-23 323-230-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 08 CA
2005-03-23 323-230-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 08 CA
2005-03-23 323-230-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 08 CA
2005-03-23 323-230-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 08 CA
2005-03-22 323-318-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 LSAN DA 05 CA
2005-03-22 323-360-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LSAN DA 05 CA
2005-03-22 323-712-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 MONTEBELLO CA
2005-03-21 323-306-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LSAN DA 08 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.