DNSStuff is an online web service that allow users to view different types of data regarding a website or IP address. Reports are grouped in a few big categories: domain tools, IP tools, networking and email tools.
Different useful reports are available for each category, such as DNS information, reverse DNS lookup, Whois lookup, SSL examination, domain inspector, website info, view HTTP headers, ping, internet speed test, view MAC address, traceroute, email spam blacklist lookup, IMAP or POP3 status and more.
This service is useful to check and diagnose health of network or web sites.