Available is a simple whois Applet that will probe any server on the Internet to tell you if it is available/up/running. It does a probe via ICMP and UDP echo port 7. IT also probes the home HTML page via port 80. As a side effect, it will tell you the IP address given the host name, or the host name given the IP address.

You can also run it as a standalone utility:

java -jar available.jar

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