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
2012-06-27 858-519-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 DEL MAR CA
2012-06-22 858-905-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RNCHOPNQTS CA
2012-06-20 858-381-6XXX 6000–6999Assigned TWC IP ENABLED SERVICES, LLC 793K RNCHOSANFE CA
2012-06-20 858-500-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J LA JOLLA CA
2012-06-15 858-649-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RNCHOBRNDO CA
2012-06-11 858-500-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C LA JOLLA CA
2012-06-05 858-400-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C RNCHOSANFE CA
2012-06-01 858-500-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA JOLLA CA
2012-06-01 858-810-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2012-06-01 858-900-2XXX 2000–2999Assigned TWC IP ENABLED SERVICES, LLC 793K LA JOLLA CA
2012-05-22 858-746-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E POWAY CA
2012-05-14 858-800-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG MRMS CA
2012-04-27 858-519-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DEL MAR CA
2012-04-27 858-943-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RNCHOBRNDO CA
2012-04-24 858-900-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2012-04-24 858-900-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2012-04-24 858-900-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2012-04-24 858-900-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2012-04-19 858-500-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C LA JOLLA CA
2012-04-12 858-230-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 LA JOLLA CA
2012-04-12 858-529-0XXX 0000–0999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 LA JOLLA CA
2012-04-12 858-529-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 LA JOLLA CA
2012-04-12 858-529-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA JOLLA CA
2012-04-12 858-529-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA JOLLA CA
2012-04-10 858-703-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F DEL MAR CA
2012-04-10 858-704-2XXX 2000–2999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F DEL MAR CA
2012-04-10 858-704-6XXX 6000–6999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F DEL MAR CA
2012-04-10 858-704-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F DEL MAR CA
2012-04-10 858-724-4XXX 4000–4999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F DEL MAR CA
2012-04-10 858-724-5XXX 5000–5999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F DEL MAR CA
2012-04-10 858-724-7XXX 7000–7999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F DEL MAR CA
2012-04-05 858-230-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2012-04-05 858-242-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2012-04-05 858-242-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2012-04-05 858-255-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2012-04-02 858-900-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C LA JOLLA CA
2012-04-02 858-900-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C LA JOLLA CA
2012-03-21 858-800-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNDG MRMS CA
2012-03-14 858-943-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RNCHOBRNDO CA
2012-03-12 858-230-6XXX 6000–6999Assigned TWC IP ENABLED SERVICES, LLC 793K LA JOLLA CA
2012-03-12 858-800-1XXX 1000–1999Assigned TWC IP ENABLED SERVICES, LLC 793K SNDG MRMS CA
2012-03-07 858-737-9XXX 9000–9999Assigned TWC IP ENABLED SERVICES, LLC 793K SNDG LVTA CA
2012-03-06 858-529-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA JOLLA CA
2012-03-01 858-432-4XXX 4000–4999Assigned TWC IP ENABLED SERVICES, LLC 793K RNCHOBRNDO CA
2012-02-17 858-780-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RNCHOPNQTS CA
2012-02-10 858-529-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA JOLLA CA
2012-01-20 858-810-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG LVTA CA
2012-01-13 858-798-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C RNCHOBRNDO CA
2012-01-05 858-444-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2012-01-05 858-524-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RNCHOBRNDO 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.