The domain_type field will be present in the response if the domain type has been categorized. The table below shows the full list of domain types and their descriptions:

Domain_type	Description
biz	The domain of a company.
disposable	Disposable domain.
edu	An educational institution.
freeisp	Free ISP (internet service provider).
gov	A government institution.
org	A non-profit organization.
paidisp	Paid ISP.
parked	The domain does not have an active website.
privacy	The domain is used to protect the privacy of the user.
wireless	Wireless domain. Do not send unsolicited emails.