# 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 (issuer, expiry), and HTTP security header analysis for a given domain.

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/v1/dns-whois-tls-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-acc42160
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iFa8rW16nGG30bheMSPP2

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-acc42160
```

Example prompt: Can you run a full DNS, TLS certificate, and HTTP security header recon on anthropic.com — I want to see the resolved IPs, who issued their cert and when it expires, and what their security grade looks like?

## When to prefer this

Choose this endpoint when you need a combined, live snapshot of a domain's DNS records, TLS certificate health, and HTTP security header posture in a single call. Ideal for OSINT workflows, vendor risk assessments, incident response triage, and compliance checks where manual inspection would be slow. Prefer this over separate DNS-only or TLS-only tools when you want a unified security summary without stitching together multiple API calls.

## Known failure modes

- Domain does not exist or fails DNS resolution — no records returned
- Domain has no HTTPS/TLS — certificate fields absent or error
- Firewall or rate-limiting blocks probe — partial or empty results
- Invalid domain format provided — validation error
- Target server unreachable or times out — timeout error

## 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-whois-tls-recon)

## Output

Returns live DNS resolution results (IPv4 and IPv6 addresses), TLS certificate metadata (issuer, expiry date, validity status), and an HTTP security grade based on observed security headers (e.g. HSTS, CSP, X-Frame-Options). Useful for rapid infrastructure recon and security posture assessment.

## 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-acc42160/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)