API URL
POST /lookup
Headers
Code
Content-Type: application/jsonBody Parameters
Param
Type
Description
domain
required
string or array
A valid domain like example.com
Example Request
Code
{
"domain": "openai.com"
}Successful Response
Status
HTML
200 OKBody
Code
{
"fromCache": true,
"domain": "openai.com",
"tld": "com",
"registrar": "MarkMonitor Inc.",
"creationDate": "2015-04-15T00:00:00Z",
"expirationDate": "2026-04-15T00:00:00Z",
"nameServers": [
"ns1.openai.com",
"ns2.openai.com"
],
"registrantRedacted": true
}Field
Type
Description
fromCache
boolean
Shows whether the result was retrieved from cached data or live registry lookup
domain
string
The fully qualified domain name that was queried for ownership intelligence
tld
string
Top-level domain extension indicating the domain registry authority (e.g., "com", "gov", "org")
tldType
string
Domain classification based on registry type and intended use category
countryCode
string
ISO 3166-1 alpha-2 country code for geographic domain association where applicable
countryName
string
Full country name corresponding to the domain's geographic or regulatory jurisdiction
region
string
Broader geographic region classification for international domain analysis
category
string
Business or organizational domain category (e.g., "government", "commercial", "nonprofit")
isGovernment
boolean
Flag indicating whether the domain is owned and operated by a government entity
registrar
string
Authorized domain registrar company responsible for domain registration management
creationDate
string
ISO 8601 timestamp indicating when the domain was first registered
expirationDate
string
ISO 8601 timestamp showing when the domain registration expires
nameServers
array
List of authoritative DNS name servers responsible for domain resolution
raw
string
Complete unprocessed WHOIS registry response text for technical analysis
registrantRedacted
boolean
Indicates whether personal contact information has been privacy-protected
error
string
—
details
string
—
Error Response
Example
Code
400 INVALID_DOMAIN – If domain format is invalid
500 WHOIS_LOOKUP_FAILED – If lookup fails or is blockedLast Updated: May 4, 2026