dnsfyi is an open-source, high-performance domain intelligence platform providing instant DNS lookup, email security validation (SPF, DKIM, DMARC), SSL monitoring, and IP reputation checks.

How fast are DNS lookups on dnsfyi?

Lookups execute in under 100 milliseconds using persistent HTTP/2 connection pooling directly to authoritative and global Anycast DoH resolvers.

Core Platform

Instant DNS & Domain Intelligence Platform

dnsfyi provides enterprise-grade, lightning-fast DNS lookup and domain security auditing. Query DNS records across global DoH resolvers, test email authentication (SPF, DKIM, DMARC, BIMI), verify SSL certificates, scan 60+ real-time DNSBL blacklists, and inspect network services in milliseconds.

Key Capabilities & Features

• Real-time DNS lookup across Cloudflare, Google, Quad9, and OpenDNS
• One-click 360° comprehensive domain security and deliverability audit
• Full email authentication suite: SPF lookup counter, DMARC policy validator, DKIM key analyzer
• Live global DNS propagation visualization across 25+ worldwide locations
• Reverse DNS (PTR) lookup, FCrDNS verification, and IP geolocation intelligence
• Free high-speed REST API and developer export tools

Frequently Asked Questions

What is dnsfyi?: dnsfyi is an open-source, high-performance domain intelligence platform providing instant DNS lookup, email security validation (SPF, DKIM, DMARC), SSL monitoring, and IP reputation checks.
How fast are DNS lookups on dnsfyi?: Lookups execute in under 100 milliseconds using persistent HTTP/2 connection pooling directly to authoritative and global Anycast DoH resolvers.