Lovely Penguin I'm a big fan of myip.wtf which, amongst all the swearing supports; text/plain myip.wtf/text (with v4 & v6 literals; Enchanting Chameleon Steep Antelope) json Repulsive Ant (with v4 & v6 literals; Weary Angelfish Purring Bobolink) XML Slimy Pelican (with v4 & v6 literals; Friendly Beaver Wicked Chameleon)