$ ping -c1 -p 005c1dc753fb45553b91f37ed2d62b00 unhack.ca
 
$ curl http://unhack.ca/p/5c1dc753fb45553b91f37ed2d62b
 
$ dig 5c1dc753fb45553b91f37ed2d62b @unhack.ca
 
$ dig 5c1dc753fb45553b91f37ed2d62b.ns.unhack.ca
 
C:\> nslookup 5c1dc753fb45553b91f37ed2d62b unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/5c1dc753fb45553b91f37ed2d62b">]>
    <foo>&xxe;</foo>
Waiting for ping...