Take an IP and try to look for the domain/host associated with it.
Free Tool to Check 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..
Extract email addresses from any kind of text content.
Convert text to ascii and the other way for any string input.
Check if the URL is cached or not by Google.
Get all possible details about a domain name.