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
2014-08-27 858-284-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 DEL MAR CA
2014-08-27 858-614-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C SNDG LVTA CA
2014-08-27 858-798-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 RNCHOBRNDO CA
2014-08-26 858-413-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C POWAY CA
2014-08-26 858-682-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C POWAY CA
2014-08-26 858-943-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C RNCHOBRNDO CA
2014-08-26 858-943-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C RNCHOBRNDO CA
2014-08-22 858-360-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C RNCHOPNQTS CA
2014-08-22 858-503-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNDG LVTA CA
2014-08-21 858-287-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2014-08-21 858-287-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2014-08-21 858-287-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2014-08-20 858-284-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 DEL MAR CA
2014-08-15 858-371-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 RNCHOPNQTS CA
2014-08-11 858-287-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2014-08-11 858-287-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2014-08-06 858-275-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2014-08-01 858-281-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA JOLLA CA
2014-08-01 858-281-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA JOLLA CA
2014-07-17 858-284-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 DEL MAR CA
2014-07-17 858-284-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 DEL MAR CA
2014-07-16 858-281-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2014-07-16 858-281-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2014-07-10 858-260-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2014-07-10 858-275-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG MRMS CA
2014-07-10 858-281-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA JOLLA CA
2014-07-03 858-281-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2014-07-03 858-281-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2014-07-03 858-284-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DEL MAR CA
2014-07-03 858-837-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RNCHOPNQTS CA
2014-06-26 858-223-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG LVTA CA
2014-06-26 858-924-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RNCHOBRNDO CA
2014-06-23 858-281-7XXX 7000–7999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 LA JOLLA CA
2014-06-20 858-602-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 POWAY CA
2014-06-19 858-365-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RNCHOPNQTS CA
2014-06-19 858-365-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RNCHOPNQTS CA
2014-06-17 858-275-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG MRMS CA
2014-06-17 858-275-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG MRMS CA
2014-06-17 858-616-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG LVTA CA
2014-06-17 858-650-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG LVTA CA
2014-06-13 858-275-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG MRMS CA
2014-06-11 858-266-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2014-06-10 858-649-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RNCHOBRNDO CA
2014-06-10 858-779-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RNCHOSANFE CA
2014-06-06 858-352-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2014-06-04 858-864-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2014-05-23 858-281-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA JOLLA CA
2014-05-15 858-284-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E DEL MAR CA
2014-05-15 858-284-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E DEL MAR CA
2014-05-12 858-465-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E DEL MAR 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.