Is there reserved OID space for internal enterprise CAs?

When provisioning a PKI for internal use, is there a private OID space that can be used without having to pay and/or register your own OID range? Think RFC1918 addresses for OID ranges.

You can register a private enterprise and then an OID will be allocated for your use as you see fit. There is no fee.

It will be under iso.org.dod.internet.private.enterprise (1.3.6.1.4.1).

For example, my company can use: 1.3.6.1.4.1.17992 for any internal and published applications that we develop.

As voretaq7 points out, you need to internally organize and keep track of how you structure your information under your assigned node. But that's your problem. :)

Note that while the registration page says:

typically used in Simple Network Management Protocol Management Information Base configurations

that's only because SNMP is the most common usage. They are for general use.