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..
Convert your HEXA color format to RGB format.
Convert your RGB color format to HEX format.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Minify your CSS by removing all the unnecessary characters.