Free domain, DNS & SSL tools
Every lookup you reach for when wiring up domains — free, fast, and gate-free.
These are for the SaaS teams who get pulled into a customer's domain setup: a CNAME that won't resolve, a certificate that expired overnight, an SPF record that quietly broke email. Paste a hostname, get a straight answer — no account, no upsell wall between you and the result.
They aren't a grab-bag either. Every check here is one Approximated already runs continuously in production, against real customer domains: the same DNS resolution, TLS handshakes, RDAP queries, and redirect tracing that have kept millions of custom domains provisioned and renewing. The free tools just let you run one on demand.
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Fetch a DKIM selector's public key and confirm the key hasn't been revoked.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