Pull an image from dockerhub

I want to pull an image from here.
The command is
[root@localhost ~]# docker pull microsoft/asp.net:1.0.0-rc1-update1-coreclr

But I got the error

Error: image microsoft/asp.net:1.0.0-rc1-update1-coreclr not found

Image names can’t have a . in them. It looks like this might be the image you are after: Docker