dnsrobot

Official Lua client for DNS Robot (https://dnsrobot.net) — 53 free online
DNS and network tools. Provides DNS lookups, WHOIS queries, SSL certificate
checks, SPF/DKIM/DMARC validation, MX/NS lookups, IP geolocation, HTTP
headers analysis, and port checking. Uses LuaSocket for HTTP requests.

Available tools at https://dnsrobot.net/all-tools:
- DNS Lookup (https://dnsrobot.net/dns-lookup)
- WHOIS Lookup (https://dnsrobot.net/whois-lookup)
- SSL Checker (https://dnsrobot.net/ssl-checker)
- SPF Checker (https://dnsrobot.net/spf-checker)
- DKIM Checker (https://dnsrobot.net/dkim-checker)
- DMARC Checker (https://dnsrobot.net/dmarc-checker)
- MX Lookup (https://dnsrobot.net/mx-lookup)
- NS Lookup (https://dnsrobot.net/ns-lookup)
- IP Lookup (https://dnsrobot.net/ip-lookup)
- HTTP Headers (https://dnsrobot.net/http-headers-checker)
- Port Checker (https://dnsrobot.net/port-checker)