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Domain OSINT, TLS Certificate & Security Headers Recon
Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from preflight.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).
Performs live DNS resolution, TLS certificate inspection, and HTTP security header grading for a given domain name.
Price / call$0.01
Success—
StatusUnknown
How this service works
Inspects live IPv4/IPv6 DNS resolution, TLS certificate issuer/expiry, and HTTP security grade. (Live x402 v2, IETF MPP & MCP endpoint at https://preflight.agentdiet.dev/v1/whois-lookup)
Output
Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, expiry date, validity status), and an HTTP security header grade reflecting the presence and quality of headers like HSTS, CSP, X-Frame-Options, and similar security controls.
Example use cases
Pre-vendor security due diligence
“Before we integrate with acme-payments.io, can you check their domain's TLS certificate issuer and expiry date, and tell me how their HTTP security headers score?”
Detecting expiring SSL certificates
“Can you check when the TLS certificate for shop.mybrand.com expires and who issued it? I want to know if we're at risk of it lapsing soon.”
Competitor infrastructure OSINT
“Run an OSINT recon on openai.com for me — I want to know its IPv4 and IPv6 DNS records, the TLS certificate details, and its HTTP security grade.”
Technical details
Endpoint
GEThttps://preflight.agentdiet.dev/v1/whois-lookup?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a combined, live view of a domain's DNS resolution, TLS certificate health, and HTTP security posture in a single call. It is ideal for security due diligence on third-party vendors, monitoring certificate expiry for owned domains, or performing lightweight OSINT on infrastructure. Prefer it over manual DNS tools or separate certificate checkers when you want a unified, structured response from a single API call priced per use.
Side effects
- Domain does not exist or fails DNS resolution — returns an error or empty DNS records
- Domain's HTTPS endpoint is unreachable — TLS and security header data may be unavailable
- Invalid or malformed domain input — returns a validation error
- Domain uses non-standard ports or configurations — may produce incomplete results
- Rate limiting or payment failure at the x402 layer — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domainrequired | string | Target domain name (e.g. anthropic.com, openai.com) for DNS, TLS certificate, and security header OSINT |
Output
Schema · Response
{
"type": "object"
}Reviews
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