# 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.

## Facts

- Endpoint: GET https://llms-generator.agentdiet.dev/v1/whois-lookup?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: llms-generator.agentdiet.dev
- Website: https://llms-generator.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/llms-generator-agentdiet-dev-domain-osint-tls-certificate-security-0b94aab5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hAO6wcwgz-D1-gr-IMEQa

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability llms-generator-agentdiet-dev-domain-osint-tls-certificate-security-0b94aab5
```

Example prompt: Can you pull the DNS records, TLS certificate details, and HTTP security header grade for anthropic.com so I can see who issued their cert, when it expires, and whether their security headers are properly configured?

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "domain"
 ],
 "properties": {
  "domain": {
   "type": "string",
   "minLength": 1,
   "description": "Target domain name (e.g. anthropic.com, openai.com) for DNS, TLS certificate, and security header OSINT"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/llms-generator-agentdiet-dev-domain-osint-tls-certificate-security-0b94aab5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from llms-generator.agentdiet.dev](https://www.zero.xyz/host/llms-generator.agentdiet.dev/llms.txt)