Take an IP and try to look for the domain/host associated with it.
Get approximate IP details.
Get all possible details about an SSL certificate.
Get all possible details about a domain name.
Ping a website, server or port..
Decode Base64 input to an image.
Convert text to binary and the other way for any string input.
Convert text to ascii and the other way for any string input.
Easily convert IDN to Punnycode and back.
Easily convert bits (bit) to zebibits (Zibit).