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curl https://ip.cn
curl icanhazip.com  
curl ident.me  
curl whatismyip.akamai.com  
curl tnx.nl/ip  
curl myip.dnsomatic.com 
curl ifconfig.me  

https://blog.csdn.net/liu0808/article/details/80769810

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curl ifconfig.me
curl http://members.3322.org/dyndns/getip

# 保存到文件 
wget http://ifconfig.me/ip
wget http://members.3322.org/dyndns/getip

http://blog.csdn.net/teddy17/article/details/12618035

curl http://myip.ipip.net/
curl cip.cc
curl ifconfig.me
curl myip.ipip.net
curl http://members.3322.org/dyndns/getip