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OS X - Development and Darwin Discussion and questions about development for Mac OS X.

Get your IP address

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If you are in a DHCP situation and find your IP address frequently changing, here is an easy way to determine it:
ipconfig getifaddr en0
and an alternate (albeit more convoluted method):
ifconfig en0 inet | grep 'inet ' | awk ' { print $2 } '

If you are behind a router and need your external IP address, issue this command:
wget -q -O /dev/stdout | grep 'Current IP Address: ' | awk ' { print $4 } '
(Of course, you would have to have wget installed in order for this to work.)

Here is a shell script for checking your IP address and logging the results to a file:
#initialize variable
IP=`wget -q -O /dev/stdout <a href='' target='_blank'></a> | grep 'Current IP Address: ' | awk ' { print $4 } '`
# prints current IP to shell
echo $IP
#log it
date >> /private/var/log/ip.log
echo $IP >> /private/var/log/ip.log
This script could be added to your crontab in order to check your IP address periodically and log the results to a file.
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the wget on doesn't seem to work anymore ... did the format change or something?
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Member Since: Feb 25, 2003
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this thread is over a year old... i almost forgot gatorparrots existed.. theres a few otherways, if you need to find it, PM and ill show u a lil thing i came across, ide post it but it may scare a few people.
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thanks Graphite... i'm behind a router so the wget method would suit me best.
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Originally Posted by StarManta
weird this site is giving me a different IP address...
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Lately, I've been using this code to obtain my external IP address:
curl -s | awk '{print $1}'
However, if you have a Linksys BEFSR-series router, the following code is better for scripting purposes, as it obtains results in about half the time:
/usr/bin/curl --connect-timeout 5  -s \
           http://:$PASSWORD@$ROUTERIP/Status.htm  | \
           sed -e 's/^.*IP Address://'              | \
           sed -e 's/=2>/\\
/'                                                  | \
           sed -e '1 d'                             | \
           sed -e 's/<.*//'
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Member Since: Mar 09, 2004
Location: Miami FL
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You can also get it by running sheilds up to compare...
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