Free DNS check
Free DNS and email security check
Check any domain's public DNS for the problems that let others spoof your email or hijack your traffic. 3 checks a day without signing up.
3 of 3 free checks left today · No sign-up. Public DNS data only.
Free, no sign-up
Email security checks
Free account
All DNS checks for the domains you verify
Sign in with Google and prove the domain is yours with a DNS record: every DNS check, 5 a day, with history. Web penetration testing is in the paid account.
DNSSEC
Whether your DNS answers are signed and the chain of trust holds.
About DNSSEC CAA
Which certificate authorities may issue certificates for your domain.
DANE / TLSA
Whether mail servers publish the certificate senders should expect.
STARTTLS
Whether your mail servers encrypt email in transit with a valid certificate.
Dangling subdomains
Subdomains pointing at services you no longer use, which others could take over.
Open resolvers
Name servers that answer anyone, which attackers abuse for amplification.