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.
Get all possible details about a domain name.
Easily download any YouTube video thumbnail in all the available sizes.
Upload a QR code image and extract the data out of it.
Ping a website, server or port..