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Reverse DNS via DNS.SB Change Watch
x402
Reverse DNS via DNS.SB 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 reverse DNS (PTR record) lookups for an IP address via DNS.SB and alerts when the result changes compared to the previous check.
Price / call$0.02
Success—
StatusUnknown
How this service works
Change watch for reverse dns via dnssb: 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 record result for the IP (via DNS.SB), a boolean 'changed' flag, a list of fields that changed with before and after values compared to the previous call for that IP (retained for 90 days), and the timestamp of when it was last seen.
Example use cases
Server hostname change detection
“Watch the reverse DNS for 198.51.100.10 and alert me if the PTR record changes — I want to know immediately if that server gets re-assigned or renamed.”
Monitoring cloud IP reassignment
“Track the reverse DNS entry for 104.21.14.89 over time; if it ever returns a different hostname than before, flag the change with what it was and what it is now.”
Security alert on unexpected PTR change
“Set up a watch on reverse DNS for 45.33.32.156 so I get notified if the PTR record changes — I need to catch any suspicious infrastructure changes as soon as they happen.”
Technical details
Endpoint
GEThttps://ip.intel.rallylive.ca/watch/ip/ptr/via/dnssb?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to detect changes in reverse DNS (PTR records) for a specific IP address over time, especially for automated monitoring or alerting workflows. It is ideal when you want diff-style output (before/after field values) rather than just the current PTR record, and when you need persistent state tracking across calls without managing your own baseline storage. Prefer it over a plain reverse DNS lookup endpoint when change detection and scheduling are the goal.
Side effects
- IP address not provided or invalid format — query fails with input error
- No previous result stored (first call for this IP) — 'changed' will be indeterminate or false with no diff
- DNS.SB resolution failure or timeout — may return an error or empty PTR result
- Previous result expired (older than 90 days) — baseline lost, treated as first call
- Rate limiting or payment failure for $0.02 USDC per call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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