Privacy first: The lookup uses a protected same-origin endpoint and fixed public data providers. No arbitrary external URLs are fetched.
ISP and ASN Lookup tool
Enter a public IPv4/IPv6 address or an autonomous system number.
Enter a public IP or ASN, or inspect the network associated with your current public IP.
Network details
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Understanding ISPs and autonomous system numbers
An autonomous system number identifies a network that announces internet routes under a common routing policy. ISPs, cloud providers, universities and large organizations may operate one or many ASNs.
- IP lookups show the provider and ASN associated with a specific public address.
- ASN lookups use RIPEstat registry data to show the holder and announcement state.
- VPNs and cloud services normally display the network owner rather than the end user’s original ISP.
Frequently Asked Questions
What is an ASN?
An autonomous system number is a globally assigned identifier for a network that exchanges routing information on the internet.
Why is the ISP different when I use a VPN?
The visible IP belongs to the VPN provider or its hosting network, so the lookup reports that network.
Can one company have several ASNs?
Yes. Large providers often operate multiple autonomous systems for different regions, services or acquired networks.