ASN Lookup — Offline

Find ASN / ISP info for IPv4 addresses using an offline dataset. Upload your CSV to extend the dataset. Quick export, copy, and sharing included.

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Tips: paste IP and press Enter. Upload CSV to add mappings.
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ASN
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ISP
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CIDR
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Lightweight • Offline-first • No external requests
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Dataset (preview)
Rows: 5
ASNCIDRISPCountryNotes
AS151698.8.8.0/24Google LLCUSPublic DNS
AS1650952.95.110.0/24Amazon.com, Inc.US
AS13335104.16.0.0/12Cloudflare, Inc.US
AS32934185.60.216.0/22Facebook, Inc.US
AS3595193.0.0.0/8RIPE-NCC ExampleEU