NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

16 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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 14
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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2014-03-18 951-376-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2014-03-17 951-349-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2014-03-17 951-349-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PERRIS CA
2014-03-17 951-380-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HEMT HEMT CA
2014-03-17 951-380-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HEMT HEMT CA
2014-03-17 951-380-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HEMT HEMT CA
2014-03-13 951-357-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HEMT HEMT CA
2014-03-07 951-432-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CORONA CA
2014-03-07 951-432-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CORONA CA
2014-03-07 951-432-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CORONA CA
2014-03-07 951-435-7XXX 7000–7999Assigned TWC IP ENABLED SERVICES, LLC 793K PERRIS CA
2014-03-07 951-902-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 MORENO CA
2014-03-04 951-379-1XXX 1000–1999Assigned TWC IP ENABLED SERVICES, LLC 793K MORENO CA
2014-03-04 951-393-0XXX 0000–0999Assigned TWC IP ENABLED SERVICES, LLC 793K CORONA CA
2014-03-03 951-366-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LAKEVIEWNU CA
2014-03-03 951-370-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SUN CITY CA
2014-03-03 951-370-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SUN CITY CA
2014-03-03 951-376-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ARLINGTON CA
2014-03-03 951-376-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ARLINGTON CA
2014-03-03 951-376-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ARLINGTON CA
2014-03-03 951-703-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MIRA LOMA CA
2014-03-03 951-923-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HEMT HMLD CA
2014-02-12 951-364-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HEMT SAGE CA
2014-02-12 951-364-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E HEMT SAGE CA
2014-02-11 951-365-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TEMECULA CA
2014-02-04 951-393-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 CORONA CA
2014-01-21 951-350-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 HEMT SNJC CA
2014-01-21 951-380-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HEMT HEMT CA
2014-01-21 951-384-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D RIVERSIDE CA
2014-01-21 951-386-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 WOODCREST CA
2014-01-14 951-319-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MURRIETA CA
2014-01-09 951-435-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PERRIS CA
2013-12-31 951-435-3XXX 3000–3999Assigned METROPCS NETWORKS, LLC 899D PERRIS CA
2013-12-31 951-435-5XXX 5000–5999Assigned METROPCS NETWORKS, LLC 899D PERRIS CA
2013-12-27 951-381-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BANNING CA
2013-12-23 951-435-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PERRIS CA
2013-12-20 951-893-9XXX 9000–9999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 CORONA CA
2013-12-09 951-363-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MORENO CA
2013-12-09 951-363-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MORENO CA
2013-12-09 951-376-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ARLINGTON CA
2013-12-09 951-399-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D ELSINORE CA
2013-12-09 951-666-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CORONA CA
2013-12-04 951-393-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 CORONA CA
2013-12-04 951-393-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 CORONA CA
2013-12-04 951-393-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 CORONA CA
2013-11-26 951-666-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CORONA CA
2013-11-25 951-298-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CORONA CA
2013-11-25 951-382-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E TEMSCL CNY CA
2013-11-25 951-384-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RIVERSIDE CA
2013-11-25 951-384-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RIVERSIDE CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.