Credential Stuffing Detection With IP Intelligence
Learn how IP velocity, reputation, network type, and account patterns help detect credential stuffing attacks.
How credential stuffing behaves
Credential stuffing uses stolen username and password pairs across many login attempts. Attackers often rotate IPs to avoid simple per-IP limits.
The traffic may come from data centers, proxies, residential networks, or mixed infrastructure.
IP signals to track
Track failed login velocity, account spread per IP, IP spread per account, ASN concentration, proxy indicators, and sudden country changes.
A single IP may stay below a limit, but a campaign often creates patterns across accounts and networks.
Defensive response
Use rate limits, MFA, breached-password checks, device reputation, bot detection, and risk-based challenges.
Crafzo IP Lookup can support manual review by showing location and risk context for suspicious login sources.
Frequently Asked Questions
Is per-IP rate limiting enough?
No. Attackers can rotate IPs, so you also need account, device, and behavior controls.
Why do attacks use many countries?
Proxy and bot networks can route attempts through many regions to evade basic rules.
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