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 - [CertGrep](https://certgrep.sh/) - SSL/TLS certificate search and monitoring.
 - [TriNetLayer](https://trinetlayer.com/) - Network layer analysis and IP intelligence.
 - [IPLoop](https://iploop.io) - Residential proxy platform (2M+ IPs, 195+ countries). Route OSINT recon through real residential IPs. Python SDK with 66 site presets.
+- [DNSai](https://dnsai.com/dns-tools/) - Free, no-signup DNS/WHOIS lookups, DKIM selector discovery, SPF/DMARC analysis, email header analysis and blacklist checks
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