Generate an MD2 hash for any string input.
Generate an MD4 hash for any string input.
Get all possible details about an SSL certificate.
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 a domain name.
Get all the HTTP headers that an URL returns for a typical GET request.