About the Subdomains Tab in Investigate

The Subdomains tab lists all subdomains associated with the domain.

Name—The subdomain of the domain.
Security Category—The type of security risk that this subdomain poses: for example, Malware. The security category is blank if the subdomain poses no risk.
First Seen—The date when the subdomain was first detected. This date is determined from the NS records for this sub domain.

For information about the subdomain, click the link for the subdomain.