Fingerprint any endpoint. One API call.
DNS4 identifies the real infrastructure behind a hostname — TLS stacks, server software, network behavior — using active fingerprinting backed by DNS Science telemetry.
curl -X POST https://api.dnsscience.io/v1/dns4/tls \
-H "Authorization: Bearer $DNSSCIENCE_API_KEY" \
-H "Content-Type: application/json" \
-d '{"target": "example.com"}'
TLS Fingerprinting
Cipher suites, extensions, and handshake behavior — identify the actual TLS implementation, not what the banner claims.
Infrastructure Identification
See through CDNs and proxies to the software and network stack actually answering.
DNS Science Telemetry
Fingerprints enriched with passive DNS and resolver intelligence from the DNS Science platform.