##### 3.2.2.5.3 Reverse Address Lookup Confirming the Applicant’s control over the IP Address by obtaining a Domain Name associated with the IP Address through a reverse-IP lookup on the IP Address and then verifying control over the FQDN using a method permitted under [Section 3.2.2.4](#3224-validation-of-domain-authorization-or-control). CAs performing validations using this method MUST implement Multi-Perspective Issuance Corroboration as specified in [Section 3.2.2.9](#3229-multi-perspective-issuance-corroboration). To count as corroborating, a Network Perspective MUST observe the same FQDN as the Primary Network Perspective.