NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

25 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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
2005-02-14 858-248-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 POWAY CA
2005-02-14 858-332-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA JOLLA CA
2005-02-08 858-740-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2005-02-08 858-740-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2005-02-03 858-717-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNDG LVTA CA
2005-01-25 858-842-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L POWAY CA
2005-01-14 858-345-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 DEL MAR CA
2005-01-13 858-248-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 POWAY CA
2005-01-04 858-375-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 POWAY CA
2004-12-10 858-217-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RNCHOBRNDO CA
2004-12-10 858-345-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 DEL MAR CA
2004-11-24 858-220-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2004-11-23 858-753-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 RNCHOBRNDO CA
2004-11-19 858-525-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J LA JOLLA CA
2004-11-16 858-729-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2004-11-12 858-218-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 POWAY CA
2004-11-12 858-218-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 POWAY CA
2004-11-05 858-771-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C RNCHOSANFE CA
2004-10-26 858-309-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG LVTA CA
2004-10-22 858-901-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 RNCHOPNQTS CA
2004-10-19 858-312-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J RNCHOBRNDO CA
2004-10-19 858-312-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J RNCHOBRNDO CA
2004-10-19 858-312-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J RNCHOBRNDO CA
2004-10-13 858-366-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2004-09-30 858-324-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J RNCHOPNQTS CA
2004-09-23 858-883-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L POWAY CA
2004-09-22 858-736-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2004-09-16 858-869-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2004-09-15 858-208-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 POWAY CA
2004-09-14 858-220-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C LA JOLLA CA
2004-09-14 858-334-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2004-09-14 858-334-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2004-09-14 858-334-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2004-09-14 858-334-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2004-09-13 858-225-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SNDG MRMS CA
2004-08-21 858-866-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA JOLLA CA
2004-08-20 858-225-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG MRMS CA
2004-08-05 858-366-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2004-07-06 858-366-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2004-06-21 858-956-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E POWAY CA
2004-06-14 858-373-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2004-06-14 858-869-3XXX 3000–3999Assigned METROPCS, INC. 5562 LA JOLLA CA
2004-06-10 858-357-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2004-06-10 858-357-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2004-06-10 858-357-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2004-05-21 858-366-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2004-05-19 858-228-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2004-05-11 858-401-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2004-05-11 858-401-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2004-05-11 858-401-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.