Take an IP and try to look for the domain/host associated with it.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get approximate IP details.
Get all possible details about an SSL certificate.
Check if the URL is cached or not by Google.
Use the Google translator API to generate text to speech audio.
Convert normal text to old english font type.
Check if the URL is banned and marked as safe/unsafe by Google.
Easily convert IDN to Punnycode and back.
Extract email addresses from any kind of text content.