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DNS Reverse-IP Lookup API
x402
DNS Reverse-IP Lookup API is a paid API for AI agents from dns.payapi.market, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-17).
Resolves an IPv4 or IPv6 address to its PTR hostname and discovers other domains hosted on the same IP.
Price / call$0.002
Success—
StatusUnknown
How this service works
DNS records, WHOIS, SSL certificate, subdomain discovery, and reverse-IP lookup with x402 payments.
Output
Returns the queried IP address, its primary PTR hostname record and any aliases, a list of other domains co-hosted on the same IP (sourced from HackerTarget), the count of co-hosted domains, and any error details from the HackerTarget lookup.
Example use cases
Identify server behind an IP
“I have an IP address 104.21.45.23 — can you do a reverse DNS lookup and tell me what hostname it resolves to and what other domains might be sharing that server?”
Security investigation of suspicious IP
“We flagged the IP 185.220.101.34 in our logs — can you reverse-resolve it to see what domain it belongs to and check if any other known domains are hosted there?”
Competitor infrastructure research
“I want to know what other websites are co-hosted on the same server as 34.102.136.180 — run a reverse IP lookup and list all the domains you find.”
Technical details
Endpoint
POSThttps://dns.payapi.market/dns/reverse?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to reverse-resolve an IP to its PTR hostname AND simultaneously discover other domains co-hosted on the same IP. It combines standard reverse-DNS with co-hosting enumeration in one call, making it ideal for security investigations, infrastructure reconnaissance, and network analysis workflows that need both pieces of data together.
Side effects
- Invalid IP format returns a validation error
- HackerTarget daily rate limit (~100/day per IP) exhausted returns hackertarget_error field populated
- IPv6 addresses may have limited co-hosted domain data
- Private/reserved IP ranges may return no PTR or co-hosted domains
- Payment failure via x402 results in 402 response before query is executed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| ip | string | IPv4 or IPv6 address to reverse-resolve, e.g. '1.1.1.1'. |
Output
Schema · Response
{
"type": "json",
"example": {
"ip": "1.1.1.1",
"ptr": {
"aliases": [],
"primary": "one.one.one.one"
},
"other_domains": [
"one.one.one.one",
"1dot1dot1dot1.cloudflare-dns.com"
],
"hackertarget_error": null,
"other_domains_count": 2,
"other_domains_source": "hackertarget.com (free, ~100/day per IP)"
}
}Tags
x402
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