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
2003-06-03 951-500-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RIVERSIDE CA
2003-05-28 951-296-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TEMECULA CA
2003-05-28 951-326-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TEMECULA CA
2003-05-28 951-326-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TEMECULA CA
2003-05-28 951-326-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TEMECULA CA
2003-05-28 951-375-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TEMECULA CA
2003-05-28 951-541-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TEMECULA CA
2003-05-22 951-436-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2003-05-22 951-667-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TEMSCL CNY CA
2003-05-21 951-892-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RIVERSIDE CA
2003-05-21 951-892-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RIVERSIDE CA
2003-05-21 951-892-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RIVERSIDE CA
2003-05-21 951-892-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RIVERSIDE CA
2003-05-20 951-602-9XXX 9000–9999Assigned PAETEC ITEL, LLC 829J ARLINGTON CA
2003-05-20 951-704-0XXX 0000–0999Assigned METROPCS NETWORKS, LLC 899D MURRIETA CA
2003-05-16 951-834-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 MURRIETA CA
2003-05-12 951-894-4XXX 4000–4999Assigned FRONTIER CALIFORNIA INC. 2319 MURRIETA CA
2003-05-07 951-892-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2003-05-07 951-892-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2003-05-06 951-246-3XXX 3000–3999Assigned FRONTIER CALIFORNIA INC. 2319 SUN CITY CA
2003-05-01 951-294-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TEMECULA CA
2003-05-01 951-294-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TEMECULA CA
2003-04-21 951-892-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 RIVERSIDE CA
2003-04-14 951-246-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SUN CITY CA
2003-04-14 951-256-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 CORONA CA
2003-04-14 951-294-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 TEMECULA CA
2003-04-14 951-306-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 HEMT HEMT CA
2003-04-14 951-324-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 ARLINGTON CA
2003-04-14 951-436-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 PERRIS CA
2003-04-14 951-571-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 MORENO CA
2003-04-14 951-704-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 MURRIETA CA
2003-04-14 951-789-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 WOODCREST CA
2003-04-08 951-436-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J PERRIS CA
2003-04-01 951-258-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CORONA CA
2003-04-01 951-258-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CORONA CA
2003-04-01 951-258-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CORONA CA
2003-04-01 951-543-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2003-04-01 951-543-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2003-04-01 951-543-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2003-04-01 951-543-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2003-04-01 951-905-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2003-03-12 951-543-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RIVERSIDE CA
2003-03-12 951-609-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ELSINORE CA
2003-03-06 951-543-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 RIVERSIDE CA
2003-03-04 951-894-6XXX 6000–6999Assigned FRONTIER CALIFORNIA INC. 2319 MURRIETA CA
2003-03-03 951-306-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HEMT HEMT CA
2003-03-03 951-443-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2003-03-03 951-443-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D PERRIS CA
2003-03-03 951-490-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PERRIS CA
2003-02-24 951-543-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RIVERSIDE 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.