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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.
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/subdomain-scan)
Output
Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, expiry date, validity status), and an HTTP security header grade assessing the presence and quality of headers like HSTS, CSP, X-Frame-Options, and related security controls.
Example use cases
Pre-acquisition domain security audit
“Before we finalize the acquisition of techstartup.io, can you pull up all the DNS records, check who issued their TLS certificate and when it expires, and give me a security header grade so I know what security debt we're inheriting?”
Monitoring competitor TLS expiry
“Can you check openai.com's TLS certificate right now — specifically who issued it and when it's set to expire? I want to know if it's coming up for renewal soon.”
Security posture check for a client site
“My client's site is myecommerce-store.com — can you audit its IPv4/IPv6 DNS resolution, TLS certificate details, and HTTP security headers so I can put together a quick security report for them?”
Technical details
Endpoint
GEThttps://llms-generator.agentdiet.dev/v1/subdomain-scan?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, consolidated OSINT snapshot of a domain's DNS posture, TLS certificate health, and HTTP security header compliance in a single call. It is ideal for pre-deal due diligence, competitor reconnaissance, client security assessments, or automated monitoring pipelines where you want live data rather than cached or historical records. Prefer it over manual dig/curl workflows or separate certificate transparency log queries when speed and consolidation matter.
Side effects
- Domain does not exist or fails DNS resolution — returns error or empty DNS fields
- Domain has no TLS certificate (HTTP-only) — certificate fields will be absent or null
- Network timeout when probing the target domain — may return partial results
- Invalid domain string provided — returns validation error
- Target domain actively blocks external probes — security headers may be unreachable
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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