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.
Ping a website, server or port..
Get all possible details about a domain name.
Convert text to ascii and the other way for any string input.
Convert text to binary and the other way for any string input.
Use the Google translator API to generate text to speech audio.