DNS Propagation Checker
Check DNS records globally, verify SSL certificates, audit security headers, test ports and more — 100% free.
50+
Free Tools
30+
DNS Servers
100%
Free & Open
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DNS Lookups
A Record Lookup
Find IPv4 address records for a domain
AAAA Record Lookup
Find IPv6 address records for a domain
MX Lookup
Find mail exchange records
CNAME Lookup
Find canonical name alias records
TXT Lookup
Find text records including SPF and DKIM
NS Lookup
Find nameserver records for a domain
SOA Lookup
Find start of authority records
CAA Lookup
Find certificate authority authorization records
Security & SSL
SSL Checker
Inspect and validate SSL/TLS certificates
SSL Expiry Checker
Check when your SSL certificate expires
Security Headers
Audit HTTP security headers on any site
CSP Checker
Validate Content Security Policy headers
HSTS Checker
Check HTTP Strict Transport Security
DNSSEC Validator
Validate DNSSEC signatures for a domain
Certificate Transparency
Search SSL certificate transparency logs
OCSP Checker
Check certificate revocation status
Email & SPF
SPF Lookup
Look up Sender Policy Framework records
DKIM Lookup
Look up DomainKeys Identified Mail records
DMARC Lookup
Check Domain-based Message Authentication
BIMI Lookup
Check Brand Indicators for Message Identification
SPF Generator
Generate an SPF record for your domain
DKIM Generator
Generate DKIM keys for email signing
DMARC Generator
Generate a DMARC policy record
Email Header Analyzer
Analyze and decode email headers
Domain & Network
WHOIS Lookup
Look up domain registration information
Reverse DNS Lookup
Find the hostname for an IP address
IP Location
Find geographic location of any IP address
Domain Expiry Checker
Check when a domain name expires
Blacklist Checker
Check if a domain or IP is blacklisted
DNS Health Checker
Run a full DNS health check on a domain
Port Checker
Test if a port is open on a host
Ping Online
Ping a hostname or IP from the web
HTTP & Performance
HTTP Header Checker
Inspect HTTP response headers
HTTP Status Checker
Check HTTP status code of any URL
HTTP/2 Test
Check if a site supports HTTP/2
HTTP/3 Test
Check if a site supports HTTP/3 / QUIC
GZIP Compression
Check if a site uses GZIP compression
CORS Tester
Test Cross-Origin Resource Sharing headers
Redirect Checker
Trace URL redirects step by step
Core Web Vitals
Measure Core Web Vitals for a URL
Trusted DNS Resolvers
We query these globally trusted providers across 30+ locations worldwide
Google DNS
8.8.8.8 8.8.4.4
Cloudflare DNS
1.1.1.1 1.0.0.1
Quad9
9.9.9.9 149.112.112.112
OpenDNS
208.67.222.222 208.67.220.220
CleanBrowsing
185.228.168.9 185.228.169.9
Comodo Secure DNS
8.26.56.26 8.20.247.20