WHOIS
Current nameservers, RDAP details and SOA dates. Dates do not prove the exact time of an NS change.
OpenFree Webmaster Tools
Check domains, SSL, DNS, compression, GeoIP, DNSBL and ASN without an account.
SSL/TLS Check
Validity period, CN/SAN, issuer, protocols, days to expiry.
OpenGzip/Brotli
Detect compression and real size savings for any URL.
OpenMail DNS Check
Check MX, SPF, DKIM and DMARC.
OpenGeoIP Service
Country / city / ASN from multiple sources side by side.
OpenIP Reputation (DNSBL)
Check one IPv4 address or a list against the configured DNSBLs.
OpenASN / Prefix Lookup
Reference origin ASN and advertised BGP prefix for an IP address.
Open
How to use the tools: choose a task, enter a domain or IP, then read the limitations shown with the result. These checks provide diagnostic reference data; verify critical decisions with the registrar, DNSBL operator or network provider.
Frequently asked questions
Are the tools free?
Yes. The online checks are available without buying a plan or signing in. Technical limits of external data sources still apply.
Where are queries sent?
It depends on the tool. Some checks contact public DNS, RDAP, WHOIS or GeoIP sources, whose own processing terms apply.
Is there an integration API?
This page does not promise a public API. If you need an integration, describe the use case to HSTQ support.
Next step
Have a result but not a clear cause?
Include the domain or IP, a screenshot of the result and the test time in your ticket. This gives support enough context to suggest the next diagnostic step.
An online check does not replace a configuration audit. DNS, mail, certificate or routing changes are quoted as a separate task.
