~/tools
// domain_tools
Free utilities. No signup. Run-once or save-and-monitor.
> /ssl-checker
SSL Checker
cert.expiry · chain · tls
> /dmarc-checker
DMARC Checker
policy · alignment · rua
> /spf-checker
SPF Checker
syntax · 10-lookup · +all
> /dkim-checker
DKIM Checker
selector · key.size · valid
> /mx-lookup
MX Lookup
priority · ips · provider
> /dns-propagation
DNS Propagation
12 resolvers · parallel
> /whois-lookup
WHOIS Lookup
registrar · expiry · ns
> /security-headers
Security Headers
hsts · csp · x-frame-opts
> /redirect-chain
Redirect Chain
301 · 302 · hop timing
> /subdomain-finder
Subdomain Finder
ct-logs · crt.sh · osint
> /blacklist-checker
Blacklist (RBL)
spamhaus · barracuda · +6
> /reverse-dns
Reverse DNS
ptr lookup · ip → host
> /dnssec-checker
DNSSEC Checker
dnskey · ds · signed?
> /http-protocol-checker
HTTP/2 + HTTP/3
alpn · alt-svc · tls
> /domain-age
Domain Age
whois · ct logs · years
> /cookie-audit
Cookie Audit
secure · httponly · samesite
> /email-auth-scanner
Email Auth Scanner
spf+dkim+dmarc+ptr+mta-sts
> /spf-generator
SPF Generator
build · validate · lookups
> /dmarc-generator
DMARC Generator
policy · alignment · rua
> /dkim-generator
DKIM Generator
rsa · 2048-bit · txt
> /bulk-checker
Bulk Checker
audit many domains at once
> /takeover-checker
Takeover Checker
dangling cname · saas · risk
> /impersonation-watcher
Typosquat Watcher
cousin-domain · phishing · osint
> /compare
Compare Domains
two domains · side-by-side
> /deliverability
Deliverability Report
ai · score · per-provider · copy-paste fixes
> /dns-explainer
DNS Explainer
ai · paste any record · plain english