NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

27 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 951
ONVOY, LLC - CA 25
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 1
BANDWIDTH.COM CLEC, 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
2021-04-12 951-629-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HEMT SNJC CA
2021-04-09 951-577-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CORONA CA
2021-04-09 951-577-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CORONA CA
2021-04-05 951-576-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 WOODCREST CA
2021-04-05 951-576-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 WOODCREST CA
2021-04-05 951-580-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2021-04-05 951-580-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2021-04-02 951-573-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2021-04-02 951-573-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2021-04-02 951-623-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2021-04-02 951-866-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2021-04-02 951-866-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2021-04-02 951-866-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2021-04-02 951-866-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2021-04-02 951-866-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2021-03-30 951-361-8XXX 8000–8999Assigned TERRA NOVA TELECOM INC. 145J MIRA LOMA CA
2021-03-23 951-539-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ARLINGTON CA
2021-03-23 951-564-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PERRIS CA
2021-03-23 951-564-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PERRIS CA
2021-03-23 951-578-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ARLINGTON CA
2021-03-22 951-517-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TEMECULA CA
2021-03-22 951-578-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2021-03-22 951-578-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2021-03-22 951-578-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2021-03-19 951-480-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C HEMT HEMT CA
2021-03-19 951-498-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C ELSINORE CA
2021-03-19 951-633-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C HEMT HEMT CA
2021-03-19 951-633-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C HEMT HEMT CA
2021-03-19 951-946-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C HEMT SNJC CA
2021-03-19 951-946-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C HEMT SNJC CA
2021-03-18 951-481-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WOODCREST CA
2021-03-17 951-644-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BANNING CA
2021-03-10 951-569-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MORENO CA
2021-03-09 951-480-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 HEMT HEMT CA
2021-03-09 951-480-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HEMT HEMT CA
2021-03-09 951-539-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ARLINGTON CA
2021-03-09 951-577-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CORONA CA
2021-02-25 951-866-6XXX 6000–6999Assigned FRACTEL, LLC 965H RIVERSIDE CA
2021-02-22 951-574-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 MURRIETA CA
2021-02-19 951-578-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2021-02-19 951-578-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2021-02-19 951-578-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2021-02-19 951-578-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2021-02-18 951-393-7XXX 7000–7999Assigned METROPCS NETWORKS, LLC 899D CORONA CA
2021-02-14 951-507-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MIRA LOMA CA
2021-02-11 951-573-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2021-02-11 951-573-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2021-02-11 951-573-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2021-02-05 951-556-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ARLINGTON CA
2021-02-05 951-556-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ARLINGTON 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.