How to identify which protocol belongs to transport layer and which protocol belongs to network layer?

To be precise , we cannot use any logic to identify a protocol by its name that it belong to which layer. For this we have to always remember it.

for eg ip belongs to layer 3 i.e network layer . 
but I want to clarify another thing here that even ip belongs to layer 3 but tcp that is a layer 4 protocol it also uses ip very frequently. 

so we have to understand that protocols actually doesn't belong to a certain layer instead it's there lookup which we generally misunderstood with there belonging. 

ip lookup is done at layer 3 where it checks the ip header's protocol field which reveals it  has received a tcp information or udp and accordingly tcp protocol's lookup is done at layer 4 .