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Reverse DNS PTR Lookup via DNSPod
x402
Reverse DNS PTR Lookup via DNSPod is a paid API for AI agents from ip.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).
Performs a reverse DNS (PTR) lookup for an IPv4 address using DNSPod (doh.pub) and returns hostname(s), TTL, response code, and forward-confirmed reverse DNS (FCrDNS) status.
Price / call$0.01
Success—
StatusUnknown
How this service works
Reverse DNS (PTR) of an IPv4 address as answered by DNSPod (doh.pub): the hostname(s), TTL and response code, plus whether the PTR's forward A record points back (forward-confirmed reverse DNS). Compare resolvers for stale or filtered answers. $0.01 per lookup.
Output
Returns the PTR hostname(s) associated with the queried IPv4 address as resolved by DNSPod (doh.pub), along with the TTL, DNS response code, and a forward-confirmed reverse DNS (FCrDNS) flag indicating whether the PTR hostname's A record resolves back to the original IP.
Example use cases
Email server rDNS validation
“Check the reverse DNS for the IP 203.0.113.45 using DNSPod and tell me if the PTR record is forward-confirmed — I need to know if this mail server will pass rDNS checks.”
Comparing resolver PTR answers
“Look up the PTR record for 1.2.3.4 via DNSPod so I can compare it against what other resolvers are returning — I want to see if the answer is stale or filtered.”
IP reputation investigation
“I'm investigating suspicious traffic from 185.220.101.10 — can you pull the reverse DNS for that IP via DNSPod and tell me the hostname, TTL, and whether the forward A record matches?”
Technical details
Endpoint
GEThttps://ip.intel.rallylive.ca/ip/ptr/via/dnspod?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you specifically need the PTR record as seen by DNSPod (doh.pub), for example to compare resolver behavior, detect filtered or stale PTR records, or validate email server rDNS from a Chinese-network perspective. If you need FCrDNS validation via a specific resolver rather than a generic rDNS lookup, this endpoint provides that explicitly.
Side effects
- No PTR record exists for the IP — NXDOMAIN or NOERROR with empty answer returned
- DNSPod resolver is unreachable or times out — upstream DNS error
- Invalid IPv4 address format supplied — request validation error
- FCrDNS check fails if the forward A record doesn't exist or doesn't match the original IP
- DNSPod may return filtered or stale records differing from authoritative answers
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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