Free Webmaster Tools
Free, no-signup tools for DNS, WHOIS, SSL, HTTP headers and email deliverability. Every result is a live lookup — nothing here is canned or cached from someone else.
DNS Lookup
Query any DNS record type for a domain
DNS Propagation Checker
See what resolvers around the world return
Domain to IP
Resolve a domain to its IPv4 and IPv6 addresses
WHOIS Lookup
Registrar, dates and nameservers for a domain
SSL Certificate Checker
Issuer, expiry, chain and hostname match
Website Status Checker
Is it up? Status code, redirects and timing
HTTP Header Checker
Response headers, caching and CDN detection
Meta Tags Checker
Title, description, canonical and social tags
SPF, DKIM & DMARC Checker
Check a domain's email authentication
IP Address Lookup
Network, ASN and reverse DNS for any IP
URL Encoder / Decoder
Percent-encode and decode text safely
Runs in your browserURL Parser
Split a URL into its component parts
Runs in your browserAbout these tools
Every tool here performs a real lookup when you press the button — a DNS query to a public resolver, a WHOIS request to the registry, a TLS handshake, an HTTP request. Nothing is canned and nothing is pre-recorded.
We do not store what you look up. There is no account, no signup and no rate card. The two URL utilities never contact us at all; they run entirely inside your browser.
They exist because we run CDNShark — a global CDN with edge delivery, DNS, VPS and hosting — and these are the checks our own team reaches for every day.