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Reverse DNS Change Watch via NextDNS
x402
Reverse DNS Change Watch via NextDNS 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 the reverse DNS (PTR) record of an IP address via NextDNS, detecting and reporting any changes since the last check.
Price / call$0.02
Success—
StatusUnknown
How this service works
Change watch for reverse dns via nextdns: 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) record for the IP, a boolean 'changed' flag indicating whether it differs from the previous check, a list of fields that changed with before/after values, and the timestamp of when the record was last seen. Previous results are retained for 90 days for comparison.
Example use cases
Server infrastructure PTR record monitoring
“Watch the reverse DNS for my server at 198.51.100.22 via NextDNS and tell me if its PTR record has changed since the last check — I want to know immediately if someone has altered the hostname.”
Suspicious IP hostname drift detection
“I'm tracking this suspicious IP 185.220.101.45 — check its reverse DNS through NextDNS and tell me whether the PTR record is different from what you saw last time, and what changed.”
Scheduled ISP reassignment alerting
“Set up a regular watch on reverse DNS for 203.0.113.10 using NextDNS so I get alerted whenever the PTR record flips, which would tell me the IP has been reassigned to a different customer or ISP block.”
Technical details
Endpoint
GEThttps://ip.intel.rallylive.ca/watch/ip/ptr/via/nextdns?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to detect changes in reverse DNS (PTR records) for specific IP addresses over time, especially via NextDNS as the resolver. Prefer this over a plain PTR lookup when you want change detection with before/after diffs rather than just the current value. Ideal for scheduled monitoring pipelines, security alerting, or ISP reassignment tracking where knowing WHAT changed matters as much as the current state.
Side effects
- IP address not provided or malformed — returns error
- NextDNS resolution failure or timeout — may return error or empty PTR
- No previous check exists for this IP yet — 'changed' will be false or indeterminate on first call
- IP has no PTR record — returns empty or NXDOMAIN response
- Payment not processed (x402) — request blocked before execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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