# AgentShelf DNS SRV Kerberos Lookup

> AgentShelf DNS SRV Kerberos Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-18).

Resolves Kerberos SRV DNS records (_kerberos._tcp.<hostname>) for a given registrable domain

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/dns-srv-kerberos?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-dns-srv-kerberos-lookup-082de289
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vcPj4_n0QNbxkdGkIJDe2

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 agentshelf-dns-srv-kerberos-lookup-082de289 -d '<json body>'
```

Example prompt: What are the Kerberos SRV DNS records for example.com — I need to find out which KDC servers that domain is advertising via _kerberos._tcp.

## When to prefer this

Use this endpoint when an agent needs to programmatically discover Kerberos Key Distribution Center (KDC) servers for a domain via DNS SRV records, particularly in enterprise authentication workflows, network configuration checks, or Kerberos realm discovery. Prefer the free sandbox endpoint (unpaid POST /v1/sandbox/dns-srv-kerberos) for testing. Choose this paid endpoint for production queries where a real authoritative DNS answer is required.

## Known failure modes

- No SRV records found — returns empty records array but still charges $0.002
- Invalid or malformed hostname input — likely validation error
- DNS resolution timeout or upstream failure — service error response
- Hostname exceeds 253 character limit — schema validation rejection
- Payment failure — x402 payment required before response is delivered

## How this service works

Call when an agent needs SRV records at _kerberos._tcp.{hostname} for Kerberos. The caller sends the registrable domain, not the underscored name. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/dns-srv-kerberos first.

## Output

Returns the SRV records found at _kerberos._tcp.<hostname>, including priority, weight, port, and target hostname for each Kerberos server entry. An empty records array is returned (and billed) if no records exist.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "hostname": {
   "type": "string",
   "examples": [
    "example.com"
   ],
   "maxLength": 253,
   "minLength": 1,
   "description": "Public DNS hostname such as example.com. Not a URL, not an IP literal, and not a private name."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentshelf-dns-srv-kerberos-lookup-082de289/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)