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..
Convert text to binary and the other way for any string input.
Decode Base64 input to an image.
Convert text to ascii and the other way for any string input.
Compress and optimize images for a smaller image size but still high quality.