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
2023-08-22 858-383-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 SNDG SNDG CA
2023-08-22 858-383-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 SNDG SNDG CA
2023-08-22 858-383-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 SNDG SNDG CA
2023-08-22 858-383-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 SNDG SNDG CA
2023-08-22 858-383-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 SNDG SNDG CA
2023-08-22 858-383-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 SNDG SNDG CA
2023-08-22 858-383-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 SNDG SNDG CA
2023-08-22 858-383-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 SNDG SNDG CA
2023-08-22 858-383-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 SNDG SNDG CA
2023-08-11 858-294-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C CHULAVISTA CA
2023-08-11 858-294-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C CHULAVISTA CA
2023-08-11 858-321-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C SNDG SNDG CA
2023-08-11 858-321-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C SNDG SNDG CA
2023-08-11 858-326-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C CHULAVISTA CA
2023-08-10 858-317-0XXX 0000–0999Assigned COMMIO, LLC 939H DULZURA CA
2023-08-10 858-317-1XXX 1000–1999Assigned COMMIO, LLC 939H DULZURA CA
2023-08-10 858-317-2XXX 2000–2999Assigned COMMIO, LLC 939H DULZURA CA
2023-08-10 858-317-3XXX 3000–3999Assigned COMMIO, LLC 939H DULZURA CA
2023-08-10 858-317-4XXX 4000–4999Assigned COMMIO, LLC 939H DULZURA CA
2023-08-10 858-331-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHULAVISTA CA
2023-08-10 858-331-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHULAVISTA CA
2023-08-10 858-331-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHULAVISTA CA
2023-08-10 858-331-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHULAVISTA CA
2023-08-03 858-374-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-08-03 858-374-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-08-03 858-374-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-08-03 858-374-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-08-03 858-374-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-08-03 858-374-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-08-03 858-374-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-08-03 858-374-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-08-03 858-374-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-08-03 858-374-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-08-02 858-217-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RNCHOBRNDO CA
2023-08-02 858-372-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-08-02 858-372-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-08-02 858-372-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-08-02 858-372-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-08-02 858-372-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-08-02 858-372-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LA JOLLA CA
2023-08-02 858-798-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RNCHOBRNDO CA
2023-07-12 858-330-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C RNCHOPNQTS CA
2023-07-12 858-369-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C DEL MAR CA
2023-07-12 858-544-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C RNCHOBRNDO CA
2023-07-12 858-544-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C RNCHOBRNDO CA
2023-06-30 858-325-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 SNDG LVTA CA
2023-06-22 858-326-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C CHULAVISTA CA
2023-06-22 858-331-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C CHULAVISTA CA
2023-06-22 858-331-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C CHULAVISTA CA
2023-06-22 858-331-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C CHULAVISTA 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.