How to start visitor notification alerts using Company DNS and Company IP?

Question

1- I need to set up visitor notification alerts using company DNS and Company IP? How to do that?
2- Second thing is, What is the common use of Company DNS and Company IP in Account fields?
Thanks

Answer 1

Shivangi,
This is largely an E9 thing - the functionality for notification has been made way easier with Profiler (yes, there is a separate license fee)
to do it without Prospect Profiler: (I think I have the actual documentation at my office - will check once I am back from #mme15
1. Go to Setup, Visitor Profiles, then edit your view to show the fields you wish to see.  Since you are specifically asking about DNS and IP address, the 'Technical Information' view is a good starting point.
2. Go to Setup, Users, User Defaults and Settings, Visitor Notification configurations.  You can use the default or create new (lower right corner)
Specify the view you wish to use.  You can also create a custom header for this notification email.
3. Go to Setup, Notifications
Configure your rules for notification.
for your second question - common use of DNS name and IP on account fields, I do not think there is a 'common use'  Since the visitor record is going to show the exact IP address and most organizations will have a range of IPs, any sort of comparison of the visitor to the account is difficult. 
If your use case is to match visitors to their account, email domain is much easier.  Create a field on the Contact and Account for 'email address domain', a string manipulation cloud app to take the email address and remove everything before the '@'  the accounts will need to be populated with the domain via a data load (or you can get close with a update rule/validation rule set to take the company name, remove spaces and special characters and append with '.com')
You could then: link contacts to accounts using this field (will need to make sure there are no duplicate company records) or use a Match/dedupe rule to grab values from the company table to update the contact. (or vice versa) 
Hope this helps.
Nathan