Free Tools
Free web utilities for developers, webmasters, and site owners — no signup, nothing to install.
DNS & Email Deliverability
DNS Checker
This free DNS checker looks up any record type for a domain and shows the live answer, with its TTL, straight from public DNS.
MX Lookup
This free MX lookup shows which mail servers receive email for a domain, in priority order, and flags the setups that make mail bounce.
SPF Record Checker
This free SPF checker validates a domain's SPF record, counts its DNS lookups against the limit of 10, and shows every include so you can see what breaks.
DMARC Checker
This free DMARC checker reads a domain's DMARC record and tells you, in plain English, how well it protects the domain from email spoofing.
DKIM Checker
This free DKIM checker finds a domain's DKIM public key, measures its strength and flags keys that are revoked, too short or still in test mode.
DNS Propagation Checker
This free DNS propagation checker asks six public DNS resolvers for the same record and shows, side by side, whether they all see your change yet.