Providing software platform systems, namely software as a service (SaaS) to enterprise domain portfolio managers with Domain and Domain Name System (DNS) security vulnerability visibility using automated proprietary discovery and audit functions and a presentation user interface to empower enterprise teams to discover, investigate, resolve, and verify that the vulnerabilities are resolved; providing SaaS systems for providing enterprise information technology infrastructure and Information Security (InfoSec) teams with DNS network visibility to empower them with a single system to manage the network represented by the DNS zone files and various resource records within those zone files; SaaS system to provide ongoing domain portfolio DNS vulnerability monitoring and reporting to SaaS system users; Providing strategic insights, remediation recommendations and execution services to SaaS subscribing organizations