ftp.ntua.gr:/debian/dists/stretch-updates/contrib/debian-installer/binary-armhf/by-hash/SHA256/?C=M&O=D 
Icon  Name                                                                         Last modified      Size  
[DIR] Parent Directory                                                                                  -   
[   ] f61f27bd17de546264aa58f40f3aafaac7021e0ef69c17f6b1b4cd7664a037ec             19-Jun-2017 23:59   20   
[   ] 47d538a09205b6240b8a395395531e310c32a6269fad3588037f33b4012cfa9e             18-Jun-2017 11:28   93   
[   ] 0040f94d11d0039505328a90b2ff48968db873e9e7967307631bf40ef5679275             18-Jun-2017 11:11   32
Apache/2.2 Server at debian.noc.ntua.gr Port 80