Tools
Network tools
Diagnose domains, servers and certificates without signing up. Checks are read-only and change nothing.
Diagnostics
DNS check
Domain records: A, AAAA, CNAME, NS, MX, TXT, SOA, CAA and SRV - all at once or of a chosen type.
WHOIS lookup
Registrar, dates and name servers of a domain.
Port check
Whether a TCP port is open on a server.
SSL check
Expiry, issuer and chain of an SSL certificate.
Mail check
SPF, DKIM, DMARC and MX records of a domain in one report.
Blacklist check (DNSBL)
Is your server IP address listed in spam databases.
Reverse DNS (PTR)
The PTR record of an IP address and whether it matches the forward record.