ftp.ntua.gr:/debian/dists/stretch-updates/non-free/by-hash/SHA256/?C=N&O=D 
Icon  Name                                                             Last modified      Size  
[DIR] Parent Directory                                                                      -   
[   ] f61f27bd17de546264aa58f40f3aafaac7021e0ef69c17f6b1b4cd7664a037ec 19-Jun-2017 23:59   20
Apache/2.2 Server at ftp.ntua.gr Port 80