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
2020-02-04 858-434-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C RNCHOPNQTS CA
2020-02-04 858-923-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C RNCHOSANFE CA
2020-02-04 858-923-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C RNCHOSANFE CA
2020-02-03 858-388-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL CAJON CA
2020-02-03 858-388-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL CAJON CA
2020-02-03 858-388-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EL CAJON CA
2020-01-31 858-583-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG LVTA CA
2020-01-15 858-585-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA MESA CA
2020-01-15 858-585-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA MESA CA
2020-01-15 858-585-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA MESA CA
2020-01-14 858-988-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C SNDG SNDG CA
2020-01-14 858-988-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SNDG SNDG CA
2020-01-14 858-988-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SNDG SNDG CA
2020-01-14 858-988-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C SNDG SNDG CA
2020-01-14 858-988-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C SNDG SNDG CA
2020-01-13 858-290-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 DEL MAR CA
2020-01-13 858-388-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 EL CAJON CA
2020-01-08 858-642-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2020-01-08 858-737-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNDG LVTA CA
2020-01-07 858-471-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG MRMS CA
2020-01-07 858-923-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RNCHOSANFE CA
2019-12-26 858-868-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG SNDG CA
2019-12-23 858-235-0XXX 0000–0999Assigned PAETEC ITEL, LLC 829J LA JOLLA CA
2019-12-23 858-235-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J LA JOLLA CA
2019-12-23 858-235-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J LA JOLLA CA
2019-12-23 858-235-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J LA JOLLA CA
2019-12-23 858-235-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J LA JOLLA CA
2019-12-23 858-235-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J LA JOLLA CA
2019-12-23 858-235-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J LA JOLLA CA
2019-12-23 858-235-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J LA JOLLA CA
2019-12-23 858-235-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J LA JOLLA CA
2019-12-23 858-235-9XXX 9000–9999Assigned PAETEC ITEL, LLC 829J LA JOLLA CA
2019-12-19 858-293-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNDG MRMS CA
2019-12-18 858-788-0XXX 0000–0999Assigned TELNYX LLC 073H LA JOLLA CA
2019-12-09 858-988-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG SNDG CA
2019-12-02 858-988-4XXX 4000–4999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNDG SNDG CA
2019-11-26 858-303-0XXX 0000–0999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-11-26 858-303-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LA JOLLA CA
2019-09-26 858-388-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 EL CAJON CA
2019-09-11 858-388-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 EL CAJON CA
2019-09-03 858-430-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG LVTA CA
2019-08-30 858-888-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LA JOLLA 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.