NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

25 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 858
ONVOY, LLC - CA 20
EXIANT COMMUNICATIONS LLC 2
PEERLESS NETWORK OF CALIFORNIA, LLC - CA 1
NEW CINGULAR WIRELESS PCS, LLC 1
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - 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
2008-12-18 858-222-5XXX 5000–5999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 LA JOLLA CA
2008-12-17 858-324-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RNCHOPNQTS CA
2008-12-17 858-523-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E DEL MAR CA
2008-12-17 858-779-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RNCHOSANFE CA
2008-12-17 858-848-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E POWAY CA
2008-12-17 858-877-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNDG MRMS CA
2008-12-03 858-771-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 RNCHOSANFE CA
2008-11-17 858-630-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SNDG MRMS CA
2008-11-14 858-210-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 LA JOLLA CA
2008-11-14 858-461-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 DEL MAR CA
2008-11-10 858-740-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 SNDG MRMS CA
2008-10-24 858-371-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RNCHOPNQTS CA
2008-10-24 858-602-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C POWAY CA
2008-10-22 858-598-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNDG LVTA CA
2008-10-22 858-598-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNDG LVTA CA
2008-10-22 858-683-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RNCHOBRNDO CA
2008-10-20 858-210-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA JOLLA CA
2008-10-20 858-369-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J DEL MAR CA
2008-10-20 858-609-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNDG LVTA CA
2008-10-20 858-935-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNDG MRMS CA
2008-10-13 858-222-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C LA JOLLA CA
2008-10-13 858-222-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C LA JOLLA CA
2008-10-13 858-222-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C LA JOLLA CA
2008-10-13 858-222-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C LA JOLLA CA
2008-10-13 858-222-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C LA JOLLA CA
2008-09-19 858-210-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA JOLLA CA
2008-09-11 858-836-1XXX 1000–1999Assigned TWC IP ENABLED SERVICES, LLC 793K SNDG LVTA CA
2008-09-11 858-836-2XXX 2000–2999Assigned TWC IP ENABLED SERVICES, LLC 793K SNDG LVTA CA
2008-09-08 858-408-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SNDG MRMS CA
2008-08-28 858-210-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C LA JOLLA CA
2008-08-25 858-625-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2008-08-25 858-737-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SNDG LVTA CA
2008-08-25 858-740-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SNDG MRMS CA
2008-08-25 858-864-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 LA JOLLA CA
2008-08-19 858-586-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SNDG MRMS CA
2008-08-19 858-598-8XXX 8000–8999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SNDG LVTA CA
2008-08-18 858-429-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2008-08-18 858-836-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 SNDG LVTA CA
2008-08-18 858-836-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 SNDG LVTA CA
2008-08-18 858-943-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RNCHOBRNDO CA
2008-08-14 858-210-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2008-08-14 858-210-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2008-08-13 858-568-9XXX 9000–9999Assigned PAETEC ITEL, LLC 829J LA JOLLA CA
2008-08-08 858-935-9XXX 9000–9999Assigned TWC IP ENABLED SERVICES, LLC 793K SNDG MRMS CA
2008-08-05 858-598-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNDG LVTA CA
2008-08-05 858-750-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA JOLLA CA
2008-08-04 858-304-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RNCHOBRNDO CA
2008-07-25 858-633-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C SNDG LVTA CA
2008-07-22 858-210-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2008-07-22 858-210-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA 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.