Do not allow IP through https

BIG-IP v11.5.1 is what I am running

Try this:

when HTTP_REQUEST {
    if { !([string tolower [HTTP::host]] equals "dns.name.com") } {
        reject
    }
}

Another Approach will be to add all virtual server IPs in a data group and write a generic irule to deny request, you can either reject or send HTML having access denied message e.g

ltm rule fqdn_access {
    when HTTP_REQUEST {
        if {[class match [HTTP::host] equals VIP_IPs] }{
                HTTP::respond 200 content {
                
                    
                        Access Denied
             
            
                    We are sorry. Use FQDN to access.
            
            
                    }
            } 
    }
    }
    DataGroup
    ltm data-group internal VIP_IPs {
    records {
    33.33.33.33 { }
    33.33.33.34 { }
}
type string
}

Thank you very much everyone, the first one worked great for me :).