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 all possible details about an SSL certificate.
Get all possible details about a domain name.
Ping a website, server or port..
Easily convert nibbles to terabits (Tbit).
Easily convert seconds to hours.
Easily convert PNG image files to ICO.
Easily convert bits (bit) to exabits (Ebit).
Convert your HEX color format to HSLA format.
Make sure your passwords are good enough.