# Reverse DNS via CleanBrowsing – Change Watch

> Reverse DNS via CleanBrowsing – Change Watch is a paid API for AI agents from ip.intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-11).

Monitors an IP's reverse DNS (PTR) record as resolved via CleanBrowsing, detects changes between calls, and returns current value, changed flag, before/after diffs, and last-seen timestamp.

## Facts

- Endpoint: GET https://ip.intel.rallylive.ca/watch/ip/ptr/via/cleanbrowsing?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/reverse-dns-via-cleanbrowsing-change-watch-ad3fb098
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wpQC4GH1wkjYMVy8qYyDC

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 reverse-dns-via-cleanbrowsing-change-watch-ad3fb098
```

Example prompt: Keep an eye on the reverse DNS record for IP 203.0.113.42 using the CleanBrowsing resolver — let me know if the PTR record has changed since the last time we checked, and show me what it changed from and to.

## When to prefer this

Use this endpoint when you need to detect changes in an IP's reverse DNS as seen through the CleanBrowsing DNS resolver specifically — ideal for security monitoring workflows that care about CleanBrowsing's view of PTR records (e.g., detecting DNS hijacking or infrastructure pivots as CleanBrowsing would observe them). Prefer over a plain PTR lookup when you need change-detection with diffing and history rather than just the current value.

## Known failure modes

- IP address not provided or malformed — returns error
- No previous call on record yet, so 'changed' is indeterminate or false by default
- CleanBrowsing DNS resolution failure or timeout
- PTR record does not exist for the IP (no reverse DNS configured)
- State older than 90 days has been purged, losing comparison baseline

## How this service works

Change watch for reverse dns via cleanbrowsing: runs the check, compares it with the result from your previous call for the same ip (kept 90 days) and returns the current answer, changed true/false, the fields that changed with before/after values, and when it was last seen. Schedule it to be alerted when this changes. $0.02 per check.

## Output

Returns the current PTR (reverse DNS) hostname for the IP as resolved by CleanBrowsing, a boolean 'changed' field indicating whether the value differs from the previous call, a structured diff of changed fields with before and after values, and a last-seen timestamp. Previous state is retained for 90 days.

## 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/reverse-dns-via-cleanbrowsing-change-watch-ad3fb098/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ip.intel.rallylive.ca](https://www.zero.xyz/host/ip.intel.rallylive.ca/llms.txt)