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
2021-09-20 858-933-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 DEL MAR CA
2021-09-20 858-933-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 DEL MAR CA
2021-09-20 858-933-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 DEL MAR CA
2021-09-20 858-933-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 DEL MAR CA
2021-09-20 858-933-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 DEL MAR CA
2021-09-17 858-786-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 NATIONALCY CA
2021-09-16 858-377-0XXX 0000–0999Assigned COMMIO, LLC 939H POWAY CA
2021-09-16 858-377-1XXX 1000–1999Assigned COMMIO, LLC 939H POWAY CA
2021-09-16 858-377-2XXX 2000–2999Assigned COMMIO, LLC 939H POWAY CA
2021-09-16 858-377-4XXX 4000–4999Assigned COMMIO, LLC 939H POWAY CA
2021-09-16 858-765-0XXX 0000–0999Assigned COMMIO, LLC 939H LA JOLLA CA
2021-09-16 858-765-1XXX 1000–1999Assigned COMMIO, LLC 939H LA JOLLA CA
2021-09-16 858-765-2XXX 2000–2999Assigned COMMIO, LLC 939H LA JOLLA CA
2021-09-16 858-765-3XXX 3000–3999Assigned COMMIO, LLC 939H LA JOLLA CA
2021-09-16 858-765-5XXX 5000–5999Assigned COMMIO, LLC 939H LA JOLLA CA
2021-09-09 858-466-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C LA MESA CA
2021-09-09 858-466-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C LA MESA CA
2021-09-09 858-758-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C EL CAJON CA
2021-09-09 858-758-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C EL CAJON CA
2021-09-09 858-758-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C EL CAJON CA
2021-09-09 858-786-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C NATIONALCY CA
2021-09-09 858-786-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C NATIONALCY CA
2021-09-09 858-786-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C NATIONALCY CA
2021-09-07 858-883-6XXX 6000–6999Assigned TERRA NOVA TELECOM INC. 145J POWAY CA
2021-08-19 858-323-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHULAVISTA CA
2021-08-19 858-323-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHULAVISTA CA
2021-08-10 858-765-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 LA JOLLA CA
2021-08-05 858-844-4XXX 4000–4999Assigned FRACTEL, LLC 965H EL CAJON CA
2021-08-05 858-933-3XXX 3000–3999Assigned FRACTEL, LLC 965H DEL MAR CA
2021-07-30 858-323-0XXX 0000–0999Assigned COMMIO, LLC 939H CHULAVISTA CA
2021-07-30 858-323-1XXX 1000–1999Assigned COMMIO, LLC 939H CHULAVISTA CA
2021-07-30 858-323-3XXX 3000–3999Assigned COMMIO, LLC 939H CHULAVISTA CA
2021-07-30 858-323-4XXX 4000–4999Assigned COMMIO, LLC 939H CHULAVISTA CA
2021-07-30 858-323-5XXX 5000–5999Assigned COMMIO, LLC 939H CHULAVISTA CA
2021-07-30 858-855-4XXX 4000–4999Assigned COMMIO, LLC 939H EL CAJON CA
2021-07-30 858-855-6XXX 6000–6999Assigned COMMIO, LLC 939H EL CAJON CA
2021-07-30 858-855-7XXX 7000–7999Assigned COMMIO, LLC 939H EL CAJON CA
2021-07-30 858-855-8XXX 8000–8999Assigned COMMIO, LLC 939H EL CAJON CA
2021-07-30 858-855-9XXX 9000–9999Assigned COMMIO, LLC 939H EL CAJON CA
2021-07-29 858-466-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA MESA CA
2021-07-29 858-466-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA MESA CA
2021-07-28 858-944-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG LVTA CA
2021-07-22 858-323-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CHULAVISTA CA
2021-07-21 858-477-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG SNDG CA
2021-07-21 858-944-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 SNDG LVTA CA
2021-07-16 858-567-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C LA JOLLA CA
2021-07-16 858-567-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C LA JOLLA CA
2021-07-16 858-567-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C LA JOLLA CA
2021-07-16 858-567-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C LA JOLLA CA
2021-07-16 858-855-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C EL CAJON 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.