find out public ip address by using any host that have 'efingerd -n'

finger @www.linuxbanks.cn | grep -oE '([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}' | head -n1
This is useful when you got a reserved IP address like 192.168.0.100 and want to find out what IP address is used to access the Internet. You have to know a server with 'efingerd -n' configured, like www.linuxbanks.cn as above. Other method to find out this information are for example access www.tell-my-ip.com and grep the output. The finger method have the advantage that it is easy to deploy a service like www.tell-my-ip.com, as you only need to get efingerd installed.

-4
2010-05-05 14:58:55

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What Others Think

why is this practical at all? curl icanhazip.com
spiffwalker · 424 weeks and 4 days ago
Grep the archive: http://www.commandlinefu.com/commands/view/2966/return-external-ip
dooblem · 424 weeks and 4 days ago

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