DNS

Reverse-DNS (PTR) lookup for an IPv4 address, with forward-confirmation

Looks up PTR hostnames for an IPv4 address and re-resolves each hostname's A records to check they point back to the original IP (forward-confirmed reverse DNS, a common sending-IP reputation signal). Rejects private/reserved IPs. Rate limit: 10 requests/minute per IP.

post/api/v1/dns/reverse

Request

  • Base URL: https://firstsales.io
  • URL: https://firstsales.io/api/v1/dns/reverse
  • Auth: none required

Request body

ipstring ipv4 required

Example request

{
  "ip": "203.0.113.10"
}

Response

Reverse DNS lookup result.

ipstring required
hostnamesstring[] required
ptrErrorstring nullable
ipClassobject
networkTypestring required

Changes

No recorded changes to this operation across all 1 revision of this API.