53 Free Online DNS & Network Diagnostic Tools
Visit DNS RobotQuery A, AAAA, MX, NS, TXT, CNAME, SOA, and SRV records from 30+ global DNS resolvers in real time.
Monitor how DNS changes propagate across global resolvers with a real-time interactive map.
Query domain registration data via RDAP and WHOIS protocols. Check registrar, expiry dates, and nameservers.
Check domain availability across 1,000+ TLDs instantly with real-time pricing from Namecheap.
Find authoritative nameservers for any domain and verify DNS delegation.
Discover mail exchange servers and their priorities for any domain.
Verify SSL/TLS certificates, check expiry dates, cipher suites, and certificate chain validity.
Validate DNSSEC configuration including DS records, DNSKEY, RRSIG, and the full chain of trust.
Inspect HTTP response headers, security headers, and server configuration for any URL.
Generate cryptographically secure passwords with customizable length and character sets.
Validate SPF records, check for syntax errors, and verify authorized mail senders.
Verify DKIM DNS records and public key configuration for email authentication.
Analyze DMARC policies, check alignment settings, and verify reporting configuration.
Test SMTP connectivity, verify STARTTLS support, and check mail server response codes.
Get geolocation, ISP, ASN, and organization data for any IP address.
Measure latency and packet loss to any host with real-time streaming results.
Trace the network path to any host, showing each hop with latency and IP details.
Test if specific TCP ports are open or closed on any host.
Check if an IP address is listed on major DNS-based blacklists (DNSBL).
Discover subdomains using Certificate Transparency logs from Certspotter and crt.sh.