Convert text to binary and the other way for any string input.
Convert text to hexadecimal and the other way for any string input.
Convert text to ascii and the other way for any string input.
Convert text to decimal and the other way for any string input.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get the gravatar.com globally recognized avatar for any email.
Get all possible details about a domain name.
Get all possible details about an SSL certificate.
Take an IP and try to look for the domain/host associated with it.
Ping a website, server or port..