It's just a little easier to define what ISN'T routable which leaves (most) everything else routable.
In IPv4 there are 3 non-routable IP ranges which are called reserved. You'll see them listed as the
class A reserved space 10.0.0.0/8
class B reserved space 172.16.0.0/12
class C reserved space 192.168.0.0/16
class E reserved for research 240.0.0.0
Companies and organization use these above ranges on the inside of their networks so these IP non-routable ranges are being used in millions of networks around the world. The neat thing is that if an Internet router receives a packet with one of these addresses in the source or destination, it will immediately drop the packet which effectively kills the link before it even gets started.
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