All tools
DNS and email diagnostics. More tools are on the way.
DNS health
Bulk DNS health
Paste many domains and get a summary table (NS, SOA, MX, WWW, overall).
Open bulk checkDMARC checker
Query _dmarc TXT, policy (none/quarantine/reject), alignment, and rua/ruf reporting.
Open DMARC checkerSPF checker
Validate SPF TXT at the domain root, list mechanisms, and flag excessive DNS lookups.
Open SPF checkerDKIM checker
Look up DKIM by selector at selector._domainkey.domain and validate key metadata.
Open DKIM checkerDNSBL lookup
Check IPv4 against Spamhaus ZEN, SpamCop, and Barracuda DNS blocklists.
Open DNSBL lookupMail tester
Send a message to a unique address and get a deliverability score (dev: upload .eml).
Open mail testerWebsite
HTTP headers
GET a URL (redirects capped) and inspect response headers with security headers highlighted.
Open HTTP headersRedirect chain
Follow GET redirects hop by hop (max 5) with status codes and Location headers.
Open redirect chainHTTP status
Quick up/down check: final status code and response time after redirects.
Open HTTP statusSSL inspector
TLS certificate expiry, issuer, protocol version, and hostname match on port 443.
Open SSL inspector