Tap the 'Share button' at the bottom of the screen:
Scroll down the list, and select 'Add to Home Screen':
Tap the menu icon (3 dots - upper right-hand corner):
and select 'Add to homescreen'.:
Reverse DNS / PTR lookup
Result
About the Reverse DNS / PTR lookup tool
This tool lets you perform DNS / PTR lookups of any IP number.
Reverse DNS is - as the name suggests - the reverse of a normal DNS lookup.
rDNS / PTR lookups translate IP to domain name. Typically used to support
security and anti-spam in connection with e-mail systems.
Also used in connection with firewalls and more advanced login systems.
Feedback
These tools are still in active development. If you have any kind of feedback, please let me know. Send me an e-mail on iamrootdottech(a)gmail.com.