When you create a domain with --portbase 30000 option, you get the following ports:

Using port 30048 for Admin.
Using port 30080 for HTTP Instance.
Using port 30076 for JMS.
Using port 30037 for IIOP.
Using port 30081 for HTTP_SSL.
Using port 30038 for IIOP_SSL.
Using port 30039 for IIOP_MUTUALAUTH.
Using port 30086 for JMX_ADMIN.
Using port 30066 for OSGI_SHELL.

Of course, you may use different port bases (31000, 32000…) for different domains.