DNS Lookup
Query DNS records for any domain using Cloudflare’s DNS over HTTPS resolver.
MX Record Check
Verify mail exchanger records, resolve hostnames, detect misconfigurations.
Blacklist Check
Check an IP address against 50+ DNS-based blackhole lists (DNSBL / RBL).
SPF Record Analyzer
Parse and validate Sender Policy Framework records, count DNS lookups, detect policy issues.
DMARC Analyzer
Inspect DMARC policy, alignment, and reporting configuration at
_dmarc.domain.
DKIM Lookup
Retrieve and validate DKIM public key records. Leave selector blank to auto-probe 20 common selectors.
HTTP Header Check
Inspect HTTP response headers and score the security posture of any URL.
WHOIS / RDAP Lookup
Retrieve domain registration, registrar, nameserver and expiry info via RDAP.
Ping / Latency Test
Measure HTTP round-trip latency to any host (ICMP is not available in Workers).