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
2019-02-07 858-951-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RNCHOSANFE CA
2019-02-07 858-951-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RNCHOSANFE CA
2019-01-22 858-288-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2019-01-21 858-284-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E DEL MAR CA
2019-01-15 858-302-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
2019-01-07 858-286-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHULAVISTA CA
2019-01-03 858-286-2XXX 2000–2999Assigned VONAGE AMERICA LLC 197D CHULAVISTA CA
2019-01-03 858-286-3XXX 3000–3999Assigned VONAGE AMERICA LLC 197D CHULAVISTA CA
2019-01-03 858-286-4XXX 4000–4999Assigned VONAGE AMERICA LLC 197D CHULAVISTA CA
2019-01-03 858-286-5XXX 5000–5999Assigned VONAGE AMERICA LLC 197D CHULAVISTA CA
2019-01-03 858-286-6XXX 6000–6999Assigned VONAGE AMERICA LLC 197D CHULAVISTA CA
2018-12-21 858-258-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2018-12-21 858-258-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2018-12-21 858-258-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2018-12-21 858-471-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2018-12-21 858-868-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG SNDG CA
2018-12-21 858-868-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG SNDG CA
2018-12-19 858-868-9XXX 9000–9999Assigned HD CARRIER LLC 321J SNDG SNDG CA
2018-12-03 858-252-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 DEL MAR CA
2018-11-26 858-286-0XXX 0000–0999Assigned VONAGE AMERICA LLC 197D CHULAVISTA CA
2018-11-26 858-286-1XXX 1000–1999Assigned VONAGE AMERICA LLC 197D CHULAVISTA CA
2018-11-14 858-649-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RNCHOBRNDO CA
2018-11-05 858-302-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG LVTA CA
2018-11-01 858-258-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SNDG MRMS CA
2018-10-17 858-879-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 RNCHOBRNDO CA
2018-10-11 858-302-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG LVTA CA
2018-10-09 858-258-5XXX 5000–5999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNDG MRMS CA
2018-10-08 858-465-8XXX 8000–8999Assigned TELNYX LLC 073H DEL MAR CA
2018-10-04 858-214-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2018-10-04 858-269-1XXX 1000–1999Assigned PACIFIC BELL 9740 POWAY CA
2018-10-04 858-302-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNDG LVTA CA
2018-10-01 858-732-5XXX 5000–5999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F LA JOLLA CA
2018-09-25 858-258-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNDG MRMS CA
2018-09-25 858-905-3XXX 3000–3999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F RNCHOPNQTS CA
2018-09-19 858-258-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SNDG MRMS CA
2018-09-12 858-987-6XXX 6000–6999Assigned METROPCS, INC. 5562 SNDG LVTA CA
2018-08-29 858-258-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG MRMS CA
2018-08-29 858-258-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG MRMS CA
2018-08-23 858-951-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 RNCHOSANFE CA
2018-08-22 858-224-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
2018-08-21 858-648-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 POWAY CA
2018-08-13 858-683-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 RNCHOBRNDO CA
2018-08-08 858-649-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RNCHOBRNDO CA
2018-06-07 858-258-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG MRMS CA
2018-05-24 858-703-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 DEL MAR CA
2018-05-18 858-209-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DEL MAR CA
2018-05-03 858-214-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LA JOLLA CA
2018-04-30 858-302-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNDG LVTA CA
2018-04-11 858-302-9XXX 9000–9999Assigned METROPCS, INC. 5562 SNDG LVTA CA
2018-04-06 858-209-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 DEL MAR 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.