NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

17 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 13
EXIANT COMMUNICATIONS LLC 2
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
2018-03-29 858-471-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2018-03-16 858-214-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2018-03-07 858-285-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG LVTA CA
2018-03-06 858-471-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2018-03-06 858-471-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2018-03-06 858-471-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2018-03-02 858-716-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RNCHOBRNDO CA
2018-02-23 858-648-1XXX 1000–1999Assigned EXIANT COMMUNICATIONS LLC 114J POWAY CA
2018-01-25 858-214-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2018-01-08 858-282-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2018-01-08 858-282-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2018-01-08 858-282-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2017-12-21 858-927-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RNCHOBRNDO CA
2017-12-08 858-209-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DEL MAR CA
2017-12-07 858-209-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 DEL MAR CA
2017-12-07 858-209-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 DEL MAR CA
2017-11-28 858-214-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2017-11-22 858-214-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2017-11-22 858-307-0XXX 0000–0999Assigned PACIFIC BELL 9740 SNDG MRMS CA
2017-11-22 858-307-1XXX 1000–1999Assigned PACIFIC BELL 9740 SNDG MRMS CA
2017-11-22 858-307-2XXX 2000–2999Assigned PACIFIC BELL 9740 SNDG MRMS CA
2017-11-22 858-307-3XXX 3000–3999Assigned PACIFIC BELL 9740 SNDG MRMS CA
2017-11-22 858-307-4XXX 4000–4999Assigned PACIFIC BELL 9740 SNDG MRMS CA
2017-11-22 858-307-5XXX 5000–5999Assigned PACIFIC BELL 9740 SNDG MRMS CA
2017-11-22 858-307-6XXX 6000–6999Assigned PACIFIC BELL 9740 SNDG MRMS CA
2017-11-22 858-307-7XXX 7000–7999Assigned PACIFIC BELL 9740 SNDG MRMS CA
2017-11-22 858-307-8XXX 8000–8999Assigned PACIFIC BELL 9740 SNDG MRMS CA
2017-11-22 858-307-9XXX 9000–9999Assigned PACIFIC BELL 9740 SNDG MRMS CA
2017-10-06 858-329-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2017-10-06 858-329-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2017-10-06 858-329-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2017-10-06 858-329-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2017-10-06 858-329-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2017-10-06 858-914-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 RNCHOSANFE CA
2017-10-05 858-209-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DEL MAR CA
2017-10-05 858-951-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RNCHOSANFE CA
2017-10-04 858-302-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2017-09-29 858-282-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG MRMS CA
2017-09-29 858-524-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RNCHOBRNDO CA
2017-09-29 858-883-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L POWAY CA
2017-09-29 858-914-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RNCHOSANFE CA
2017-09-28 858-209-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L DEL MAR CA
2017-09-28 858-282-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2017-09-26 858-209-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 DEL MAR CA
2017-09-15 858-203-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2017-09-15 858-346-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2017-08-14 858-282-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG MRMS CA
2017-08-14 858-283-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2017-08-14 858-283-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2017-08-07 858-285-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 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.