NMap Host Scan VS Network Scan Question

[h4344]

So this is definitely me not knowing nearly enough about networking but when i scan a live host on my lab network with Nmap (Using Metasploitable as the OS as a VM) i get a list of services and the ports they run on as you would expect.

However if i perform a scan using my ISP provided IPV6 IP address i simply get the port 111 and rpcbind.

So all im trying to confirm is, i wont actually be able to get a list of services and ports for a particular host until im in the network, correct? Scanning the ISP IP is basically just scanning my router isn't it?