This website will tell you your IP[v4|v6] addresses.
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This website can also be shell scripted using curl:IP6=`curl -s 6.ipquail.com/ip` or
IP4=`curl -s 4.ipquail.com/ip` or
PTR6=`curl -s 6.ipquail.com/ptr` or
PTR4=`curl -s 4.ipquail.com/ptr`