DNS Tools
A set of tools for looking up DNS records, testing mail authentication (DKIM, MTA-STS), checking IPs against DNS blacklists, and inspecting the DNS protocol itself. Most of these query public DNS-over-HTTPS resolvers directly from your browser to show you real, live results rather than a canned simulation.
DNS Propagation Checker
Query multiple public DNS resolvers at once to see whether a record has propagated.
Open toolMTA-STS Checker
Check a domain's MTA-STS DNS record and try to fetch its policy file.
Open toolDNS Blacklist Checker
Check whether an IPv4 address is listed on common spam DNSBLs.
Open toolDKIM Record Checker
Look up and parse a domain's DKIM public key TXT record for a given selector.
Open toolDNS Name Compression Tool
See how domain names get compressed into DNS message wire format with pointers.
Open toolMX Record Lookup
Look up a domain's MX records, sorted by delivery priority.
Open toolDNS Zone File Generator
Build a BIND-style DNS zone file from SOA fields and a list of resource records.
Open toolDMARC Record Checker
Look up a domain's DMARC policy TXT record and flag common misconfigurations.
Open toolSPF Record Checker
Look up a domain's SPF TXT record, list its mechanisms, and flag common misconfigurations.
Open tool