$ dig
DNS lookup
Inspect A, AAAA, MX, TXT, NS, CNAME, and SOA records for any domain — useful for debugging email, SSL, or migrations.
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All tools →Domain availability checker
See if a domain is available, who registered it, when it expires, and what nameservers it uses.
SSL certificate checker
Inspect any site's SSL/TLS certificate — issuer, validity dates, SANs, and chain length.
HTTP headers checker
Fetch a URL's response headers and audit for missing security best practices.