# 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.

## Facts

- Endpoint: GET https://llms-generator.agentdiet.dev/v1/subdomain-scan?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-fb40a8b5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FawDFQ6fx5wQo3Tb4buuO

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-fb40a8b5
```

Example prompt: Can you run a full DNS, TLS certificate, and security headers check on anthropic.com and tell me what IP addresses it resolves to, who issued the cert and when it expires, and how well it scores on security headers?

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## 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-fb40a8b5/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)