How to use ASN data in your risk checks
Score, do not just block. Pass traffic from residential ISP ASNs, challenge medium-risk cases, and block or step up verification for hosting and data-center ASNs combined with a VPN or proxy flag. Apply the check at signup, login, and checkout. Be careful with corporate VPNs, which are legitimate but look like hosting traffic, so weight the ASN alongside account history rather than blocking on it alone.
Getting ASN risk data
For one-off checks, use the ASN Lookup tool. For real-time scoring in your app, Abstract's IP Intelligence API returns the ASN, its type, and risk flags in a single request. See how to look up an ASN with an API to wire it in.
Frequently Asked Questions
Why is an IP's ASN useful for fraud detection?
The ASN tells you who operates an address. Traffic from hosting and data-center ASNs is far more likely to be a bot or proxy than a real user on a residential ISP.
How do I use ASN data to catch bots?
Flag requests from hosting and data-center ASNs, especially combined with VPN or proxy flags, and apply stricter checks at signup, login, and checkout.
Should I block all data-center ASNs?
No. Score instead of hard-blocking. Corporate VPNs use data-center ASNs legitimately, so weight the ASN with other signals and account history.
What ASN data helps with security?
The ASN type (ISP, hosting, business, education, or government) plus anonymization flags like is_vpn, is_proxy, and is_tor give you a clear risk picture for each IP.
How do I get ASN risk data in real time?
Use an API. The IP Intelligence API returns the ASN, its type, and risk flags for any IP in a single request, so you can score traffic as it arrives.
