Diagnostic tools
Every check in one place. Filter by category or search by name.
DNS
DNS Lookup
Query any DNS record type for a domain.
DNS
A Lookup
Resolve IPv4 (A) records for a hostname.
DNS
AAAA Lookup
Resolve IPv6 (AAAA) records for a hostname.
DNS
MX Lookup
List mail exchangers and their priorities.
DNS
NS Lookup
List the authoritative name servers.
DNS
TXT Lookup
Read TXT records including SPF and verification tokens.
DNS
CNAME Lookup
Follow canonical name aliases.
DNS
SOA Lookup
Inspect the Start of Authority record.
DNS
SRV Lookup
Resolve service (SRV) records.
DNS
CAA Lookup
See which CAs may issue certificates.
DNS
PTR / Reverse DNS
Resolve an IP address back to a hostname.