Most breaches start with an asset the security team didn't know existed.
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Find every subdomain, every IP, every forgotten dev environment your organization has exposed in DNS.
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You can't protect what you don't know you own.
Modern engineering teams spin up subdomains constantly: staging.app.example.com,
old-api.example.com, vendor-test.example.com. Some get shut down. Some don't. Most
security inventories miss the ones that don't.
DNSArchive sees every domain that resolves — including the ones your own engineers register on personal credit cards and forget about. With 509+ million domains archived and historical DNS records going back years, you can map your full external footprint in seconds:
Concrete examples of attack-surface discovery using DNSArchive.
staging-, test-, demo-, old- subdomains that your team thought were retired but are still resolving.
SaaS subdomains under your apex that no one in security registered — provisioning trails from departed employees, marketing-led tools, etc.
Which third parties are operating subdomains under your DNS. Vendor management isn't always up-to-date with the actual DNS reality.
What IPs has app.example.com resolved to over the past three years? Useful for incident response and confirming infrastructure migrations are complete.
Reverse-IP lookup shows what other domains live on your servers. A breach there could pivot to you.
Add your apex domains as “brands” to get alerted whenever a new subdomain appears or any infrastructure changes.
The full 509M+ domain database is free to search at /search — no signup required. Try a search for your own apex domain right now and see what shows up.
When you're ready for continuous monitoring, our paid plans add: alerts when new subdomains appear, infrastructure-change detection, the JSON API for programmatic access, and pre-grouped per-brand dashboards.
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DNSArchive is a passive-DNS dataset. We see what the public internet sees: domains that resolve, IPs they point at, and the records published in their zones. No agents, no integrations on your end — which is also exactly what an attacker doing reconnaissance would see. The fastest way to get on your own attacker's blind side is to look at your own external surface from their angle.
Pair this with our Brand Protection feature for a full picture: your own assets on one side, every domain trying to look like you on the other.
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