WHOIS Lookup
Look up a domain's registry or registrar WHOIS response, including referrals, raw registration data, source and query time.
Open WHOIS LookupDirect answer: Use WHOIS or RDAP for registration, DNS tools for delegation and records, IP tools for allocation and routing, and website checks for current HTTP or TLS observations.
Use WHOIS or RDAP for registration evidence, move to the DNS report for resolver-visible service records, and use the website uptime check only for a timestamped HTTP observation. For JSON integrations, follow the lookup API documentation.
For narrower questions, screen a name with the domain name availability screening, inspect an address with the PTR and reverse DNS tool, or normalize a non-ASCII hostname with the internationalized domain converter before running another lookup.
Registration records
Query the systems that describe who operates a domain and where the record comes from.
RDAP Lookup
Look up structured domain or IP registration data with typed events, entity roles, notices, status codes and source links.
Open RDAP LookupIP WHOIS Lookup
Inspect the registered range, country, status, events, notices and raw RDAP response published for an IP address.
Open IP WHOIS LookupDomain Availability Check
Combine DNS and registration evidence without pretending that a lookup can guarantee purchase availability.
Open Domain Availability CheckDNS and infrastructure
Follow the delegation and network evidence that connects a name to internet services.
DNS Lookup
Look up A, AAAA, MX, NS, TXT, CAA and SOA records with response meaning, observed values, TTLs and query time preserved.
Open DNS LookupDNS Report
Review seven DNS record families and flag missing address, mail, nameserver and authority evidence from this resolver.
Open DNS ReportDNSSEC Check
Compare the parent DS records with the domain's published DNSKEY set and report whether a cryptographic key match is visible.
Open DNSSEC CheckNameserver Lookup
Look up a domain's published NS records, then resolve the IPv4 and IPv6 addresses currently used by each authoritative nameserver.
Open Nameserver LookupReverse DNS Lookup
Run a reverse DNS lookup for a public IPv4 or IPv6 address to find its published PTR hostname and aliases, with source and query time.
Open Reverse DNS LookupIP to ASN Lookup
Map a public IPv4 or IPv6 address to the ASN, organization, ISP and network context reported by the lookup source.
Open IP to ASN LookupWebsite checks
Test observable website behavior with narrowly scoped, abuse-resistant diagnostics.
Website Uptime Check
Check one public URL's HTTP status, redirect location, server header and total response time from this probe.
Open Website Uptime CheckSSL Certificate Check
Inspect a public host's TLS certificate subject, issuer, covered names, validity dates and negotiated cipher without treating encryption as identity proof.
Open SSL Certificate CheckHTTP Headers Check
Inspect HTTP response headers, caching directives and browser security policies such as CSP and HSTS without executing page scripts.
Open HTTP Headers CheckIDN and Punycode Converter
Convert an internationalized domain between Unicode and ASCII, then compare the exact hostname used by DNS and certificates.
Open IDN and Punycode Converter