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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 llms-generator.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).
Performs live DNS resolution (IPv4/IPv6), TLS certificate inspection (issuer/expiry), 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://llms-generator.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 indicating the presence or absence of headers such as HSTS, CSP, X-Frame-Options, and similar security controls.
Example use cases
Pre-acquisition domain security audit
“Before we finalize this acquisition, can you check the TLS certificate issuer and expiry, DNS resolution, and HTTP security headers for targetcompany.com so I can flag any security gaps in my due diligence report?”
Monitoring competitor SSL posture
“Look up the TLS certificate details and security header grade for competitor.io — I want to know who issued their cert, when it expires, and whether they have HSTS enabled.”
Incident response domain OSINT
“We've flagged suspicious-domain.net in our logs — can you do a full DNS and TLS certificate recon on it, including IPv4/IPv6 resolution and what the certificate issuer looks like?”
Technical details
Endpoint
GEThttps://llms-generator.agentdiet.dev/v1/whois-lookup?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, single-call OSINT snapshot of a domain's DNS posture, TLS certificate health, and HTTP security configuration. It is ideal for due diligence workflows, security audits, or incident response triage where you need certificate issuer/expiry and header grades without running your own infrastructure. Prefer this over generic WHOIS tools when you specifically need TLS and security header data combined with DNS resolution in one response.
Side effects
- Domain does not exist or fails to resolve — may return empty DNS records or an error
- TLS certificate not present on domain (HTTP-only) — TLS fields may be null or absent
- Domain blocks security header inspection — partial results returned
- Invalid or malformed domain input — API returns validation error
- Transient network timeout when reaching the target domain — may return an error or incomplete data
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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