Inspect any site, right here.
Point a tool at a domain or URL and get the answer.
WHOIS Lookup
Registration, nameservers, DNS records, and TLS cert for any domain
Ping
Reachability + latency: DNS resolve, TCP connect, and HTTP HEAD
DNS Lookup
A, AAAA, MX, NS, TXT, SRV, CAA, SOA — over DNS-over-HTTPS
SSL Certificate Inspector
Issuer, validity, days-to-expiry, SANs, key size, chain
HTTP Headers & Redirects
Redirect chain, request/response headers, per-hop timing
robots.txt Tester
Validate robots.txt + test if a URL is crawlable
Open Graph Inspector
Preview how a link unfurls on social + every meta tag
Diagnostics for the modern web
Where IP Tools answer questions about an address or your own connection, Web Tools answer questions about a site: who registered the domain, whether it's reachable, what DNS records and TLS certificate it presents, and how its server responds. Most run over modern, shell-free paths (RDAP instead of legacy WHOIS, DNS-over-HTTPS, native TLS inspection) so there's nothing to install and nothing unsafe on the server.
Read more on MDNNeed more web tools?
Browse the full kit — IP utilities, hash generators, encoders, converters, and more.