DNS
DNS record lookup
Inspect published A, AAAA, CNAME, MX, NS, TXT, SOA, and other domain records.
Tool catalog
Choose a check by task. Forms work without registration; query results are not intended for indexing.
Domains
WHOIS domain lookup
Inspect available registration dates, registrar, statuses, and nameservers.
Domains
Domain search and availability
Check name options across selected TLDs and continue to an independent registrar review.
Domains
Combined domain report
Combine WHOIS, DNS, GeoIP, and reverse DNS while preserving each signal's meaning.
Networks
GeoIP and ASN lookup
Inspect network registration, ASN, and approximate IP geolocation.
Networks
Reverse DNS and FCrDNS
Find an IP's PTR and check whether its name resolves back to the original address.
Sites
External site checker
Combine DNS, HTTP, IP, and public registry status in one external check.
Security
Bounded security checks
Run authorized bounded port and passive WordPress checks, not a full penetration test.
Sites
Public RKN registry domain check
Compare a domain with a loaded public registry snapshot and show check context.
DNS
Mail DNS records
Check MX, SPF, DKIM, and DMARC records for mail delivery diagnostics.
DNS
DNS propagation
Compare DNS answers from different public resolvers to verify changes have propagated.
Networks
CIDR calculator
Subnet calculation from CIDR notation: network address, broadcast, mask, host range.
Sites
HTTP headers
Check server response headers: status, server, content-type, cache-control and others.
Security
SSL certificate checker
Domain SSL/TLS certificate check: issuer, validity, SANs, and days remaining.
Security
Security headers
HTTP security headers analysis: CSP, HSTS, X-Frame-Options, Referrer-Policy and others.
Not sure where to start?
Pick a scenario — we will point you to the right tools and guides.
Check a specific domain
Enter a domain and get DNS, WHOIS, and network in one report.
Check a site end-to-end
DNS, HTTP, SSL, and external availability in one check.