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
2004-05-11 858-401-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2004-04-21 858-300-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SNDG LVTA CA
2004-04-21 858-300-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SNDG LVTA CA
2004-03-24 858-373-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2004-03-16 858-227-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RNCHOSANFE CA
2004-03-08 858-401-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 LA JOLLA CA
2004-03-08 858-401-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 LA JOLLA CA
2004-03-08 858-401-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 LA JOLLA CA
2004-03-08 858-401-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 LA JOLLA CA
2004-03-07 858-947-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C DEL MAR CA
2004-02-12 858-213-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 POWAY CA
2004-02-11 858-525-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2004-02-11 858-525-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2004-02-05 858-240-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RNCHOPNQTS CA
2004-01-27 858-617-7XXX 7000–7999Assigned PACIFIC BELL 9740 DEL MAR CA
2004-01-14 858-243-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 POWAY CA
2004-01-14 858-248-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 POWAY CA
2004-01-14 858-248-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 POWAY CA
2004-01-14 858-248-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 POWAY CA
2004-01-14 858-437-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2004-01-14 858-437-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2004-01-14 858-437-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2004-01-14 858-437-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2004-01-14 858-761-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2004-01-13 858-312-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RNCHOBRNDO CA
2004-01-13 858-668-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 POWAY CA
2004-01-12 858-729-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2004-01-12 858-729-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2003-10-31 858-375-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 POWAY CA
2003-10-24 858-428-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J RNCHOPNQTS CA
2003-10-17 858-243-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 POWAY CA
2003-10-17 858-525-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2003-10-17 858-692-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2003-10-17 858-692-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2003-10-16 858-200-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2003-10-16 858-200-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2003-10-16 858-220-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2003-10-16 858-228-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2003-10-09 858-752-0XXX 0000–0999Assigned METROPCS, INC. 5562 LA JOLLA CA
2003-09-25 858-761-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2003-09-25 858-761-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2003-09-25 858-761-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2003-09-12 858-736-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2003-09-03 858-752-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2003-08-01 858-752-8XXX 8000–8999Assigned METROPCS, INC. 5562 LA JOLLA CA
2003-07-16 858-208-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 POWAY CA
2003-07-16 858-208-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 POWAY CA
2003-07-16 858-208-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 POWAY CA
2003-07-15 858-736-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2003-06-25 858-752-9XXX 9000–9999Assigned METROPCS, INC. 5562 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.