##### 3.2.2.5.1 Agreed-Upon Change to Website
Confirming the Applicant's control over the requested IP Address by confirming the presence of a Request Token or Random Value contained in the content of a file or webpage in the form of a meta tag under the "/.well-known/pki-validation" directory, or another path registered with IANA for the purpose of validating control of IP Addresses, on the IP Address that is accessible by the CA via HTTP/HTTPS over an Authorized Port. The Request Token or Random Value MUST NOT appear in the request.
If a Random Value is used, the CA SHALL provide a Random Value unique to the certificate request and SHALL not use the Random Value after the longer of
i. 30 days or
ii. if the Applicant submitted the certificate request, the time frame permitted for reuse of validated information relevant to the certificate (such as in [Section 4.2.1](#421-performing-identification-and-authentication-functions) of this document).
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 challenge information (i.e. Random Value or Request Token) as the Primary Network Perspective.