Free tools

DNS tools that actually tell you something.

No signup. No ads. Every finding tells you the fix.

Paste a domain. 60+ checks across delegation, DNSSEC, mail, TLS, CAA, blocklists, registration. Every finding has a fix.

IPv4 + IPv6 subnet math, subnet planner (split into N or fit N hosts), cloud reservation footnotes for AWS / Azure / GCP. Shareable URL state.

Subdomain Takeover Scanner

Coming · Soon

Enumerate subdomains via CT logs, find ones pointing to dead cloud resources you can claim back. Free attack-surface check.

CT Log Search

Coming · Soon

Every TLS cert ever issued for a domain. Flag unexpected issuers. Subscribe for alerts on new ones.

NS Migration Wizard

Coming · Soon

Step-by-step plan to move your domain to dnswiz from Cloudflare, Route 53, NS1, or anywhere else. With TTL countdowns and rollback steps.