#国内某网站的接口，只返回IP
curl ip.6655.com/ip.aspx
curl whatismyip.akamai.com
#更多用法访问ifconfig.co
wget -qO - ifconfig.co

curl icanhazip.com
dig +short myip.opendns.com @resolver1.opendns.com

curl ident.me
curl v4.ident.me
curl v6.ident.me
#慢
curl curlmyip.com 
curl ifconfig.me
curl inet-ip.info


#返回IP和地区
curl ip.6655.com/ip.aspx?area=1
curl ip.cn
curl cip.cc


#需要翻墙，只返回IP
curl ip.appspot.com

#参考 http://unix.stackexchange.com/questions/22615/how-can-i-get-my-external-ip-address-in-bash
#有人给了以下测试方法

wget https://raw.githubusercontent.com/rsp/scripts/master/externalip-benchmark
chmod a+x externalip-benchmark
./externalip-benchmark