# Kerberos SRV Record Lookup via Cloudflare DoH

> Kerberos SRV Record Lookup via Cloudflare DoH is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Resolves _kerberos._tcp.<domain> SRV DNS records via Cloudflare DNS-over-HTTPS, returning priority, weight, port, and target host for Kerberos service discovery.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/srv/kerberos-tcp?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kerberos-srv-record-lookup-via-cloudflare-doh-4c955a0f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hWnvWKMI1QdZSizkqf8Me

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 kerberos-srv-record-lookup-via-cloudflare-doh-4c955a0f
```

Example prompt: Can you look up the Kerberos SRV DNS record for example.com and tell me which host and port the Kerberos service is running on?

## When to prefer this

Choose this endpoint when you need to programmatically discover the Kerberos KDC (Key Distribution Center) host and port for a domain via standards-compliant DNS SRV resolution, especially when you want answers from Cloudflare's reliable DoH resolver rather than the local system resolver. Ideal for automation pipelines, infrastructure checks, and cross-network lookups where local DNS may be unreliable.

## Known failure modes

- Domain has no _kerberos._tcp SRV record (NXDOMAIN or empty answer section)
- Domain does not exist (NXDOMAIN)
- Cloudflare DoH upstream timeout or error
- Malformed domain input causing DNS query failure
- SERVFAIL response if the authoritative DNS server is unreachable

## How this service works

KERBEROS service discovery (_kerberos._tcp.<domain>): SRV records with priority, weight, port and target host, from Cloudflare DoH. Tells a client where the domain's kerberos service lives without guessing hosts. $0.01 per lookup.

## Output

Returns the SRV record data for _kerberos._tcp.<domain> including one or more entries with priority, weight, port number, and target hostname, along with TTL and DNS response code, as answered by Cloudflare DNS-over-HTTPS.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/kerberos-srv-record-lookup-via-cloudflare-doh-4c955a0f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from dns.intel.rallylive.ca](https://www.zero.xyz/host/dns.intel.rallylive.ca/llms.txt)