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..
Easily convert nibbles to terabits (Tbit).
Easily convert seconds to hours.
Easily convert bits (bit) to exabits (Ebit).
Easily convert PNG image files to ICO.
Convert your HEX color format to HSLA format.
Make sure your passwords are good enough.