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Reverse DNS (PTR) Lookup
x402
Reverse DNS (PTR) Lookup is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Resolves an IPv4 or IPv6 address to its hostname via a PTR record, returning the ARPA name and TTL.
Price / call$0.01
Success—
StatusUnknown
How this service works
Reverse DNS (PTR) lookup: the hostname for an IPv4 or IPv6 address, with the arpa name and TTL. Identify servers, mail hosts and hosting providers from an IP. $0.01 per lookup.
Output
Returns the resolved hostname (PTR record target), the ARPA domain name (e.g. 8.8.8.8.in-addr.arpa), and the TTL of the PTR record for the queried IP address.
Example use cases
Identify mail server behind IP
“I'm seeing emails coming from 185.220.101.45 — can you do a reverse DNS lookup and tell me what hostname that IP resolves to so I can figure out if it's a legit mail host?”
Investigate suspicious server IP
“We're seeing traffic from 203.0.113.72 in our logs — do a reverse DNS lookup on it and tell me the PTR record and TTL so I can identify what server or hosting provider it belongs to.”
Enrich IP data for abuse report
“I need the hostname and ARPA name for 2001:4860:4860::8888 — run a reverse DNS lookup so I can include the PTR record details in my network abuse report.”
Technical details
Endpoint
GEThttps://intel.rallylive.ca/dns/reverseWhen to prefer
Use this endpoint when you need to resolve an IP address to a human-readable hostname using DNS PTR records, especially for identifying mail servers, hosting providers, or server infrastructure. Prefer this over forward DNS lookups when you start from an IP and need the associated domain. At $0.01 per call it is cost-effective for on-demand enrichment of individual IPs in security, deliverability, or network analysis workflows.
Side effects
- No PTR record exists for the IP — returns empty or NXDOMAIN-equivalent result
- Invalid IP address format — query rejected
- IPv6 address not found in reverse DNS — returns null hostname
- Network timeout or DNS resolver error — service may return an error response
- Private/reserved IP ranges may have no public PTR records
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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