Free domain, DNS & SSL tools
Check DNS records, SSL certificates, domain registration, and HTTP responses. No signup required.
DNS & email
Pull A, AAAA, MX, TXT, NS and CNAME records for any domain in a single query.
Query five public resolvers at once to see whether a record has propagated everywhere yet.
Follow a hostname's CNAME chain all the way to whatever it ultimately points at.
List every TXT record on a domain, sorted into SPF, DKIM, DMARC and verification buckets.
Parse a domain's SPF record and count its DNS lookups against the limit of ten.
Read a domain's DMARC policy and see whether it actually enforces anything.
Fetch a DKIM selector's public key and confirm the key hasn't been revoked.
HTTP & TLS
Inspect a host's live TLS certificate: expiry countdown, issuer, and SANs.
See the response headers a URL returns and grade its security headers A to F.
Trace every hop in a URL's redirect chain, all the way to the final destination.
Check whether a URL is up and how fast it responds, without following redirects.
Domains & IP
Look up a domain's registrar, key dates, nameservers and status via RDAP.
Find a domain's registration date and exactly how many years old it is.
Check whether a domain is unregistered, or compare a name across several TLDs.
Run a PTR lookup to find the hostnames that point back at an IP address.
These are the spot-checks. Approximated is what runs them for every customer domain, all the time.
Approximated automates custom domains end to end
DNS checks, SSL certificates, renewals, and routing for every customer domain — provisioned and monitored automatically, from 100 domains to millions.
Try it free