Free online network utilities

Hosting metrics

Independent reviews of online service providers that include daily tests of reliability and speed. Provided by RealMetrics.

If you want to use Domain Dossier more than the limit of 50 times per day, you can get a paid account that enables you to use it as much as you need.

Domain Dossier: Investigate domains and IP addresses. Get registrant information, DNS records, and more.
Domain Check: See if a domain is available.
Email Dossier: Validate and investigate email addresses.
Browser Mirror: See what your browser reveals.
Ping: See if a host is reachable.
Traceroute: Trace the network path from this server to another.
NsLookup: Look up various domain resource records with this version of the classic NsLookup utility.
AutoWhois: Get Whois records automatically for domains worldwide.
TcpQuery: Grab a web page, look up a domain, and more.
AnalyzePath: Do a simple, graphical traceroute.