Free tools · no signup
Free domain health checks
The four silent failures that take sites down: an expired cert, a drifted DNS record, a lapsed domain, broken email auth. Check any of them in seconds, free.
SSL certificate checker
Check any domain’s SSL certificate in seconds: expiry date, days remaining, issuer and whether the chain is trusted.
- Expiry date & days remaining
- Chain trust
- Issuing CA
DNS record checker
Look up the records that keep a site reachable (A, AAAA, MX, NS and TXT) and spot drift before it breaks anything.
- A / AAAA / MX / NS / TXT
- Propagation sanity check
- Drift spotting
Domain expiry checker
See exactly when a domain registration lapses, with dates straight from the registry via RDAP rather than a stale WHOIS mirror.
- Registry (RDAP) data
- Renewal date
- Registrar
SPF & DMARC checker
Verify the email-authentication records that decide whether your mail lands in the inbox or in spam.
- SPF record & syntax
- DMARC policy
- Deliverability risks
Checking by hand doesn’t scale.
VigilDog runs all four checks continuously across every client domain and warns you days before anything breaks.
Free for your first domain · No card