NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 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, all time — NPA 310
T-MOBILE USA, INC. 498
LEVEL 3 COMMUNICATIONS, LLC - CA 246
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 215
NEW CINGULAR WIRELESS PCS, LLC 198
ONVOY, LLC - CA 177
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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2017-07-03 310-682-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 HAWTHORNE CA
2017-07-03 310-682-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 HAWTHORNE CA
2017-06-28 310-620-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2017-05-18 310-620-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C BEVERLYHLS CA
2017-05-16 310-340-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C HAWTHORNE CA
2017-05-09 310-340-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAWTHORNE CA
2017-04-10 310-554-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CMTN CMTN CA
2017-04-10 310-554-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CMTN CMTN CA
2017-04-10 310-554-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CMTN CMTN CA
2017-04-05 310-340-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAWTHORNE CA
2017-03-21 310-340-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 HAWTHORNE CA
2017-03-15 310-340-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C HAWTHORNE CA
2017-03-08 310-620-0XXX 0000–0999Assigned INTEGRATED PATH COMMUNICATIONS, LLC - CA 707H BEVERLYHLS CA
2017-02-28 310-340-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C HAWTHORNE CA
2017-02-28 310-340-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C HAWTHORNE CA
2017-02-28 310-340-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C HAWTHORNE CA
2017-02-16 310-554-4XXX 4000–4999Assigned TWC IP ENABLED SERVICES, LLC 793K CMTN CMTN CA
2017-02-09 310-554-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 CMTN CMTN CA
2017-01-17 310-340-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAWTHORNE CA
2017-01-17 310-554-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2016-12-21 310-999-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CMTN GRDN CA
2016-11-08 310-929-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C AVALON CA
2016-10-28 310-997-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C LOMITA CA
2016-10-18 310-945-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CULVERCITY CA
2016-09-14 310-294-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2016-08-23 310-448-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNMN MRVS CA
2015-08-26 310-928-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CMTN CMTN CA
2015-07-28 310-431-4XXX 4000–4999Assigned TWC IP ENABLED SERVICES, LLC 793K INGLEWOOD CA
2015-06-05 310-401-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNMN SNMN CA
2014-08-07 310-648-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 EL SEGUNDO CA
2014-07-30 310-648-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 EL SEGUNDO CA
2014-07-30 310-953-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2014-07-30 310-974-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2014-06-26 310-484-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 INGLEWOOD CA
2014-05-07 310-654-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 INGLEWOOD CA
2014-04-14 310-774-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MALIBU CA
2014-04-14 310-774-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MALIBU CA
2014-04-10 310-692-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 INGLEWOOD CA
2014-03-31 310-439-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNMN MRVS CA
2014-03-31 310-651-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2014-03-14 310-905-8XXX 8000–8999Assigned TWILIO INTERNATIONAL, INC. 506J SNMN MRVS CA
2014-03-05 310-925-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BEVERLYHLS CA
2014-03-04 310-925-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2014-02-05 310-725-8XXX 8000–8999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 HAWTHORNE CA
2013-12-04 310-957-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 INGLEWOOD CA
2013-10-18 310-947-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 REDONDO CA
2013-09-19 310-910-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 INGLEWOOD CA
2013-09-19 310-981-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 INGLEWOOD CA
2013-09-13 310-307-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C W ANGELES CA
2013-06-20 310-896-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 REDONDO 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.