[Question] Only three DVD images on the server?

[Nico Schmoigl <nico@schmoigl-online.de>]

Hi folks,

I am currently a little confused on the content of  
https://cdimage.debian.org/debian-cd/current/amd64/iso-dvd/:
I do see there the following three files:

debian-9.1.0-amd64-DVD-1.iso
debian-9.1.0-amd64-DVD-2.iso
debian-9.1.0-amd64-DVD-3.iso

There is no 4th or 5th image available. Requesting the fourth image at  
https://cdimage.debian.org/debian-cd/current/amd64/iso-dvd/debian-9.1.0-amd64-DVD-4.iso also fails with a 404 HTTP  
error.
Yet, the SHA256SUMS file at  
https://cdimage.debian.org/debian-cd/current/amd64/iso-dvd/SHA256SUMS  
lists images up to number 14.

Is there something broken with the server or is this intentional  
(whose announcement I simply might have missed)?

Thanks for checking!

Kind regards,
Nico