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.

Webmaster Tools

Free online checks for administrators, developers and site owners: WHOIS/RDAP, SSL/TLS, Gzip/Brotli, mail DNS, GeoIP, DNSBL and ASN. No account or plan purchase is required.

WHOIS

Current nameservers, RDAP details and SOA dates. Dates do not prove the exact time of an NS change.

Open

SSL/TLS Check

Validity period, CN/SAN, issuer, protocols, days to expiry.

Open

Gzip/Brotli

Detect compression and real size savings for any URL.

Open

Mail DNS (MX/SPF/DKIM/DMARC)

Quick zone validation for deliverability and outbound auth.

Open

GeoIP Service

Country / city / ASN from multiple sources side by side.

Open

IP Reputation (DNSBL)

Check one IPv4 address or a list against the configured DNSBLs.

Open

ASN / 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.

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.

Open a Ticket