Free, fast diagnostic tools for DNS, email authentication, and network security
6 hours ago
- #DNS Tools
- #Network Security
- #Email Authentication
- Free, fast diagnostic tools covering DNS, email authentication, and network security.
- Query multiple DNS record types (A, AAAA, MX, TXT, etc.) directly from authoritative nameservers.
- Simultaneously query 7 global public resolvers to check DNS propagation worldwide.
- Verify DNSSEC chain of trust by checking DS, DNSKEY, and RRSIG records.
- Look up RDAP registration data for domains/IPs (registrar, status, expiry dates, contacts).
- Detect public IPv4/IPv6 addresses with geolocation, ISP name, and live map.
- Send ICMP echo requests to measure round-trip times and packet loss statistics.
- Trace network path hop-by-hop with real-time results and router geolocation.
- Check IP/domain against 15+ DNS-based blocklists in parallel.
- Inspect SSL/TLS certificate details (expiry, SANs, chain) for any hostname.
- View HTTP response headers, redirect chains, and flag missing security headers.
- Test HTTP/2 and HTTP/3 support (ALPN, Alt-Svc, HTTPS redirect, HSTS).
- Test TCP port status (open/closed) and grab server banners (SSH, SMTP, FTP).
- Get SPF + DMARC health grade (A–F) with breakdown and actionable recommendations.
- Look up and validate SPF records, recursively expanding include chains.
- Look up and validate DMARC records with tag explanations and warnings.
- Look up and validate DKIM public keys (key size, flags, configuration).
- Paste email headers to trace delivery path, check SPF/DKIM/DMARC, and find delays.
- Build valid SPF records by selecting providers and entering IP ranges.
- Build valid DMARC records with policy, reporting URIs, and alignment options.
- Validate MTA-STS DNS records and policy files (mode, max_age, MX coverage).
- Validate BIMI DNS records, preview SVG brand logo, and check VMC certificate URLs.