optools.com :: the admin's swiss knife

What is my IP?

See your computer's calling IP and hostname
Your IP
Reverse DNS Hostname

PING (ICMP)

Check the connection to a IP or hostname using the ping command
IP / Hostname
 

NSLookup (DNSQuery)

Query a nameserver for a domain/hostname
DNS-Server
Query (Domain/IP)

Traceroute

See the path of Packets from this server to the selected one
IP / Hostname