All tools
Every tool works right away, without signing up. Enter a domain or an IP address and get the result with an explanation.
DNS
DNS record lookup
A, AAAA, CNAME, MX, NS, TXT, SOA and CAA records with TTL.
TXT record lookup
TXT records named one by one: SPF, DKIM, DMARC and ownership tokens.
DNS configuration check
Name servers, addresses, mail and DNSSEC in one report.
DNS propagation check
Whether a record change has reached the public resolvers yet.
MX record lookup
Mail servers, priorities, IP addresses and PTR records.
SPF record check
Syntax, the include chain and the ten DNS lookup limit.
SPF record generator
One valid record from the services you use, with the lookups counted.
DKIM record check
The public key, its length and errors in the record.
DKIM key generator
A 2048 bit key pair made in your browser, with the record to publish.
DMARC record check
Policy, rua and ruf addresses, alignment and errors.