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
2007-04-23 858-412-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA JOLLA CA
2007-04-20 858-617-2XXX 2000–2999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 DEL MAR CA
2007-04-20 858-617-3XXX 3000–3999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 DEL MAR CA
2007-04-20 858-617-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 DEL MAR CA
2007-04-20 858-617-5XXX 5000–5999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 DEL MAR CA
2007-04-18 858-776-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RNCHOBRNDO CA
2007-04-06 858-412-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA JOLLA CA
2007-04-06 858-947-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 DEL MAR CA
2007-04-02 858-215-7XXX 7000–7999Assigned PACIFIC BELL 9740 RNCHOPNQTS CA
2007-04-02 858-215-8XXX 8000–8999Assigned PACIFIC BELL 9740 RNCHOPNQTS CA
2007-04-02 858-215-9XXX 9000–9999Assigned PACIFIC BELL 9740 RNCHOPNQTS CA
2007-03-30 858-436-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 DEL MAR CA
2007-03-29 858-842-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 POWAY CA
2007-03-23 858-384-2XXX 2000–2999Assigned TWC IP ENABLED SERVICES, LLC 793K SNDG LVTA CA
2007-03-23 858-384-7XXX 7000–7999Assigned TWC IP ENABLED SERVICES, LLC 793K SNDG LVTA CA
2007-03-20 858-312-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 RNCHOBRNDO CA
2007-03-20 858-353-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DEL MAR CA
2007-03-20 858-524-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 RNCHOBRNDO CA
2007-03-01 858-202-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 LA JOLLA CA
2007-02-27 858-369-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J DEL MAR CA
2007-02-27 858-737-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNDG LVTA CA
2007-02-27 858-768-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA JOLLA CA
2007-02-27 858-768-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA JOLLA CA
2007-02-27 858-768-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA JOLLA CA
2007-02-27 858-768-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA JOLLA CA
2007-02-13 858-740-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2007-02-13 858-740-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2007-02-01 858-437-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C SNDG MRMS CA
2007-01-26 858-429-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNDG LVTA CA
2007-01-16 858-652-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2007-01-16 858-652-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2007-01-11 858-381-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 RNCHOSANFE CA
2006-12-18 858-365-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C RNCHOPNQTS CA
2006-12-18 858-947-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C DEL MAR CA
2006-12-07 858-652-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J LA JOLLA CA
2006-12-07 858-652-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J LA JOLLA CA
2006-12-07 858-652-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J LA JOLLA CA
2006-11-22 858-206-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C POWAY CA
2006-11-22 858-652-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 LA JOLLA CA
2006-11-22 858-652-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 LA JOLLA CA
2006-11-20 858-356-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 DEL MAR CA
2006-11-16 858-746-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 POWAY CA
2006-11-15 858-649-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 RNCHOBRNDO CA
2006-11-14 858-634-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2006-10-20 858-345-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 DEL MAR CA
2006-10-20 858-704-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 DEL MAR CA
2006-10-13 858-634-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2006-10-03 858-798-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C RNCHOBRNDO CA
2006-09-27 858-412-4XXX 4000–4999Assigned TWC IP ENABLED SERVICES, LLC 793K LA JOLLA CA
2006-09-27 858-412-5XXX 5000–5999Assigned TWC IP ENABLED SERVICES, LLC 793K 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.