What are good services for checking the external IP of a machine? [closed]

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I'm working with an API that requires the machine's external IP. I have come understand that I can't do this without relying on an external server.

I've used whatismyip.com in the past:

wget -q -O - http://whatismyip.com/automation/n09230945.asp

What are some other services for checking the external IP of a machine? Since I'm concerned about a single point of failure, I'd like to have a few options to which I can fail over.

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curl -s http://checkip.dyndns.org | sed 's/[a-zA-Z/<> :]//g'

Now, I didn't write that myself, just doing some research for you.

http://www.geekology.co.za/blog/2009/04/checking-your-internal-and-external-ip-addresses-on-a-unix-machine/

Or

wget -O -q icanhazip.com

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http://api.externalip.net/ip works fine for me, great uptime and fast. no reg exp needed

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• http://www.showmemyip.com
• http://www.whatismy.com
• http://showip.codebrainz.ca/ (details)