Create device with a specific connector and network via API.

Create device with a specific connector and network via API.

I have the current problem. I want to create a device connected to a specific connector and network via API. Your documentation shows that this is possible with the requests

Post: Create new Device

Post: Create a new Immutable Device

Both of them have the fields 
"network": "5bbd0d144051a50034cd19fb",
"connector": "5f5a8f3351d4db99c40dece5",

But I cannot find the ids for the connectors and networks. How can I find them?
I would like to create 2 devices via api:
1- Connector:Custom Everynet Network: LoRaWAN Everynet
2- Connector: Custom HTTPS Network: HTTPS

Similar to the picture below