# Domain OSINT, TLS Certificate & Security Headers Recon

> Domain OSINT, TLS Certificate & Security Headers Recon is a paid API for AI agents from serp-extract.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 a given domain.

## Facts

- Endpoint: GET https://serp-extract.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: serp-extract.agentdiet.dev
- Website: https://serp-extract.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/serp-extract-agentdiet-dev-domain-osint-tls-certificate-security-ae45c790
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YsoOWVOXphApPm_lBkrwJ

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 serp-extract-agentdiet-dev-domain-osint-tls-certificate-security-ae45c790
```

Example prompt: Can you do a full security recon on anthropic.com — I want to see its DNS resolution (IPv4 and IPv6), TLS certificate issuer and expiry, and how its HTTP security headers grade out?

## When to prefer this

Choose this endpoint when you need a single-call, live OSINT snapshot covering DNS (IPv4/IPv6), TLS certificate metadata, and HTTP security header grading for a domain — especially useful for security audits, vendor due diligence, certificate monitoring, or reconnaissance workflows where you want correlated infrastructure signals in one response rather than calling separate DNS, SSL, and header tools independently.

## Known failure modes

- Domain does not exist or fails DNS resolution — returns empty or error response
- Domain has no TLS certificate (HTTP-only) — certificate fields may be null or absent
- Firewall or CDN blocking probe requests — may return incomplete or timeout responses
- Invalid domain format supplied — API may return a validation error
- Transient network issues causing lookup failures

## 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://serp-extract.agentdiet.dev/v1/asn-lookup)

## Output

Returns live IPv4 and IPv6 DNS resolution results, TLS certificate issuer and expiry details, and an HTTP security header grade for the queried domain, packaged as a structured JSON object.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "domain"
 ],
 "properties": {
  "limit": {
   "type": "integer",
   "default": 20,
   "maximum": 100,
   "minimum": 1,
   "description": "Maximum number of items to return per page (1-100)"
  },
  "cursor": {
   "type": "string",
   "description": "Opaque pagination cursor for fetching the next page"
  },
  "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/serp-extract-agentdiet-dev-domain-osint-tls-certificate-security-ae45c790/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from serp-extract.agentdiet.dev](https://www.zero.xyz/host/serp-extract.agentdiet.dev/llms.txt)