Network Diagnostics Suite

Network Diagnostics

All-in-one DNS lookup, IP geolocation, WHOIS, SSL, HTTP headers, and subnet calculator. Free, no sign-up.

DNS Lookup
A, AAAA, MX, TXT, NS, SOA records
A
AAAA
CNAME
MX
TXT
NS
SOA
CAA
SRV
PTR

About These Tools

Built for developers, sysadmins, and IT professionals who need quick network diagnostics. All lookups run from our servers, so results reflect the actual resolved values from authoritative DNS and RDAP registries — not your browser's cached data.

  • DNS Lookup uses DNS-over-HTTPS (Cloudflare + Google fallback) for privacy.
  • IP Lookup uses ip-api.com's free geo database (city-level accuracy, ASN included).
  • WHOIS uses modern RDAP protocol (structured JSON, faster than legacy WHOIS).
  • SSL Checker performs a real TLS 1.3 handshake to inspect the live certificate chain.
  • HTTP Headers flags common security headers (HSTS, CSP, X-Frame-Options, etc.).
  • Subnet Calculator runs entirely in your browser — no data leaves.