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..
Generate an MD5 hash of 32 characters length for any string input.
Easily download any YouTube video thumbnail in all the available sizes.
Parse details from any URLs.
Validate JSON content and make it looks good.
Upload a QR code image and extract the data out of it.