Get your external IP address if your machine has a DNS entry

host $HOSTNAME|cut -d' ' -f4
Using DynDNS or a similar service not only allows access to your home machine from outside without needing to know what IP the ISP has assigned to it but it also comes in handy if you want to know your external IP address. The only purpose of the sed command is to remove the leading " has address " part from the output. If you don't need to discard it you can simply use host $HOSTNAME

By: penpen
2009-08-08 12:39:00

2 Alternatives + Submit Alt

What Others Think

host $HOSTNAME|head -1 |cut -d' ' -f4
commandlinefu · 672 weeks and 4 days ago
This might not give you what you want, depending on which version of host you have. Different hosts have different output formats. dig +short is defintely the better option, because there's only the ISC version of dig (afaik). The curl alternative does something completely different; it just tells you what your external ip address is, it doesn't resolve your hostname.
andrew112358 · 671 weeks and 5 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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