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
2005-06-21 858-248-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 POWAY CA
2005-06-21 858-386-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 POWAY CA
2005-06-17 858-822-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2005-06-17 858-822-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2005-06-17 858-869-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2005-06-10 858-309-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SNDG LVTA CA
2005-06-09 858-216-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 RNCHOPNQTS CA
2005-06-03 858-386-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 POWAY CA
2005-05-27 858-357-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNDG MRMS CA
2005-05-27 858-357-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C SNDG MRMS CA
2005-05-26 858-740-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2005-05-26 858-740-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2005-05-24 858-842-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L POWAY CA
2005-05-22 858-227-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 RNCHOSANFE CA
2005-05-22 858-227-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 RNCHOSANFE CA
2005-05-22 858-227-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 RNCHOSANFE CA
2005-05-22 858-227-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 RNCHOSANFE CA
2005-05-22 858-400-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 RNCHOSANFE CA
2005-05-22 858-400-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C RNCHOSANFE CA
2005-05-22 858-400-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 RNCHOSANFE CA
2005-05-10 858-227-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 RNCHOSANFE CA
2005-04-25 858-805-2XXX 2000–2999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SNDG MRMS CA
2005-04-25 858-805-3XXX 3000–3999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SNDG MRMS CA
2005-04-25 858-805-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SNDG MRMS CA
2005-04-25 858-805-8XXX 8000–8999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SNDG MRMS CA
2005-04-25 858-805-9XXX 9000–9999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SNDG MRMS CA
2005-04-14 858-348-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNDG MRMS CA
2005-04-07 858-248-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 POWAY CA
2005-04-07 858-248-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 POWAY CA
2005-04-06 858-736-8XXX 8000–8999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 LA JOLLA CA
2005-03-10 858-300-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SNDG LVTA CA
2005-03-10 858-525-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2005-03-10 858-882-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2005-03-10 858-964-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2005-03-09 858-380-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG LVTA CA
2005-03-09 858-380-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG LVTA CA
2005-03-08 858-752-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2005-03-07 858-726-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 POWAY CA
2005-03-07 858-726-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 POWAY CA
2005-03-07 858-726-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C POWAY CA
2005-03-07 858-726-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C POWAY CA
2005-03-07 858-726-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C POWAY CA
2005-02-25 858-539-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2005-02-25 858-539-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2005-02-22 858-201-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG MRMS CA
2005-02-22 858-866-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA JOLLA CA
2005-02-22 858-926-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA JOLLA CA
2005-02-17 858-228-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2005-02-17 858-610-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNDG MRMS CA
2005-02-15 858-769-5XXX 5000–5999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNDG LVTA 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.