# 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 (IPv4/IPv6), TLS certificate inspection, and HTTP security header grading for any target domain.

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/v1/dns-recon?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: preflight.agentdiet.dev
- Website: https://preflight.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/preflight-agentdiet-dev-domain-osint-tls-certificate-security-headers-d8eb147f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aYNasqhcuea-Y4CDCtzqi

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 preflight-agentdiet-dev-domain-osint-tls-certificate-security-headers-d8eb147f
```

Example prompt: Can you run a full DNS and TLS recon on openai.com — I want to see what IPs it resolves to, who issued the SSL certificate and when it expires, and how it scores on HTTP security headers?

## When to prefer this

Choose this endpoint when you need a quick, live, all-in-one domain security snapshot covering DNS, TLS, and HTTP headers without standing up your own tooling. Ideal for OSINT workflows, pre-deployment security checks, certificate expiry monitoring, and competitive infrastructure reconnaissance. Prefer it over generic DNS lookup tools when you also need TLS and security header data in a single call.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns empty or error result
- Domain resolves but TLS handshake fails (expired cert, self-signed, wrong hostname) — certificate data may be partial or flagged
- Domain parameter missing or empty — request rejected with validation error
- Network timeout reaching the target domain — may return partial results or timeout error
- IPv6-only domains on IPv4-only infrastructure — IPv6 result may be unavailable

## 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/dns-recon)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, expiry date, chain details), and an HTTP security header grade reflecting the presence or absence of headers like HSTS, CSP, X-Frame-Options, and others.

## 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/preflight-agentdiet-dev-domain-osint-tls-certificate-security-headers-d8eb147f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from preflight.agentdiet.dev](https://www.zero.xyz/host/preflight.agentdiet.dev/llms.txt)