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
2013-06-19 310-307-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 W ANGELES CA
2013-06-19 310-465-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 REDONDO CA
2013-06-19 310-483-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TORRANCE CA
2013-06-19 310-879-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CMTN GRDN CA
2013-06-10 310-921-8XXX 8000–8999Assigned TWC IP ENABLED SERVICES, LLC 793K REDONDO CA
2013-06-05 310-596-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CULVERCITY CA
2013-06-04 310-504-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E REDONDO CA
2013-06-04 310-504-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E REDONDO CA
2013-06-04 310-870-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E REDONDO CA
2013-05-28 310-504-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 REDONDO CA
2013-05-24 310-499-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BEVERLYHLS CA
2013-05-09 310-919-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MALIBU CA
2013-05-08 310-596-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CULVERCITY CA
2013-05-08 310-730-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E CULVERCITY CA
2013-04-25 310-957-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E INGLEWOOD CA
2013-04-23 310-981-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 INGLEWOOD CA
2013-04-05 310-461-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BEVERLYHLS CA
2013-04-05 310-461-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BEVERLYHLS CA
2013-04-05 310-504-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 REDONDO CA
2013-04-05 310-730-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CULVERCITY CA
2013-04-03 310-579-6XXX 6000–6999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F MALIBU CA
2013-04-03 310-693-5XXX 5000–5999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F INGLEWOOD CA
2013-04-03 310-695-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F INGLEWOOD CA
2013-04-03 310-928-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2013-03-19 310-504-0XXX 0000–0999Assigned TWC IP ENABLED SERVICES, LLC 793K REDONDO CA
2013-03-15 310-755-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TORRANCE CA
2013-03-15 310-803-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TORRANCE CA
2013-03-12 310-627-9XXX 9000–9999Assigned TWC IP ENABLED SERVICES, LLC 793K CMTN CMTN CA
2013-03-12 310-730-6XXX 6000–6999Assigned TWC IP ENABLED SERVICES, LLC 793K CULVERCITY CA
2013-03-12 310-905-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SNMN MRVS CA
2013-03-12 310-905-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C SNMN MRVS CA
2013-03-01 310-730-5XXX 5000–5999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CULVERCITY CA
2013-03-01 310-905-3XXX 3000–3999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNMN MRVS CA
2013-02-27 310-627-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C CMTN CMTN CA
2013-02-21 310-730-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CULVERCITY CA
2013-02-20 310-957-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 INGLEWOOD CA
2013-02-20 310-981-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 INGLEWOOD CA
2013-02-08 310-803-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TORRANCE CA
2013-02-07 310-730-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CULVERCITY CA
2013-02-07 310-919-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MALIBU CA
2013-02-01 310-627-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CMTN CMTN CA
2013-01-30 310-307-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J W ANGELES CA
2013-01-30 310-627-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CMTN CMTN CA
2013-01-30 310-730-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CULVERCITY CA
2013-01-24 310-596-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CULVERCITY CA
2013-01-23 310-307-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C W ANGELES CA
2013-01-22 310-627-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CMTN CMTN CA
2013-01-22 310-627-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CMTN CMTN CA
2013-01-14 310-905-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNMN MRVS CA
2013-01-14 310-905-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNMN MRVS 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.