There is no Appleshare "IP" 3 or 4. The IP part was introduced in versions 5 and 6, meaning that earlier versions are Appletalk only.
There is, however, Shareway IP, which allows you to access an Appleshare 3 or 4 server using the IP protocol, like from X.4.
Now to your question: Appleshare 3 ran on a 68030; 4 was available in two versions, one for the 68040 and the other for (as I recall) nubus ppc. Appleshare 4 works VERY well on a base 7.1 install: extremely stable.
There is also Appleshare Pro, which runs on A/UX.
There is a lengthy document on Apple's website somewhere which lists the requirements in detail.