Free tool — no signup required
Domain & Website Health Checker
Validate your DNS, email deliverability (SPF/DMARC), and SSL security — explained in plain English.
What this checker validates
A / CNAME resolution
Confirms your domain resolves to a live address and surfaces every IP behind it.
MX mail routing
Verifies your domain can actually receive email before customers bounce.
SPF policy
Detects missing, duplicate, or unenforced SPF records that let attackers spoof you.
DMARC enforcement
Flags monitor-only (p=none) policies that silently sink deliverability.
SSL certificate
Reads live expiry and warns before the padlock breaks.
HTTP status & latency
Real request timing and status code from our probe network.