Directory

Complete Directory of DNS & Domain Security Tools

Discover our comprehensive suite of 25+ free online diagnostic and security tools designed for network engineers, system administrators, and security professionals. From instant DNS lookups and email authentication audits to SSL certificate validation, IP geolocation, subdomain recon, and WHOIS registry data — every tool is built for speed, accuracy, and zero friction.

Key Capabilities & Features

dnsfyi combines high-speed global Anycast DNS queries with comprehensive security auditing into a unified diagnostic suite.

• DNS record lookup (A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, PTR)
• Email security and authentication audits (SPF, DKIM, DMARC, BIMI)
• SSL certificate validation, cipher audit, and expiration alerts
• 60+ DNSBL IP and domain reputation blacklist scanners
• Global DNS propagation mapper with live response latencies
• Subdomain asset discovery, port scanner, and typosquatting recon

Frequently Asked Questions

Find direct answers about dnsfyi's multi-resolver query engine, privacy policy, domain security checks, and free REST API.

How many tools does dnsfyi offer?: dnsfyi currently offers 25+ specialized DNS, email security, SSL, network intelligence, and domain reconnaissance tools — all accessible from a single platform with no account required.
Are all tools completely free?: Yes. Every tool on dnsfyi is free to use without registration, including the REST API for programmatic access.