# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from github-audit.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).

Inspects a domain's live DNS resolution (IPv4/IPv6), TLS certificate issuer and expiry, and HTTP security header grade for OSINT and reconnaissance purposes.

## Facts

- Endpoint: GET https://github-audit.agentdiet.dev/v1/asn-lookup?utm_source=zero.xyz
- Price: $0.01/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: github-audit.agentdiet.dev
- Website: https://github-audit.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/github-audit-agentdiet-dev-domain-osint-tls-certificate-security-985aa3f6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_siJmV7siBUjUV1TmYIt2w

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 github-audit-agentdiet-dev-domain-osint-tls-certificate-security-985aa3f6
```

Example prompt: Can you run a full domain OSINT check on anthropic.com — I want to see the DNS records, TLS certificate issuer and expiry date, and the HTTP security header grade?

## When to prefer this

Choose this endpoint when you need a combined OSINT snapshot of a domain's DNS, TLS certificate health, and HTTP security posture in a single call. It is ideal for security reconnaissance, vendor due diligence, certificate expiry monitoring, and pre-deployment audits. Prefer this over generic DNS lookup tools when you also need TLS issuer/expiry and security header grading together.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns error or empty DNS records
- Domain has no HTTPS/TLS endpoint — TLS certificate fields may be null or absent
- Unreachable host (firewall, timeout) — may return partial results or timeout error
- Invalid domain format provided — returns validation 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://github-audit.agentdiet.dev/v1/asn-lookup)

## Output

Returns live IPv4 and IPv6 DNS resolution results, TLS certificate metadata (issuer, expiry date, validity status), and an HTTP security header grade reflecting the domain's web security posture.

## 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/github-audit-agentdiet-dev-domain-osint-tls-certificate-security-985aa3f6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from github-audit.agentdiet.dev](https://www.zero.xyz/host/github-audit.agentdiet.dev/llms.txt)