Summary

Network id is impossible to establish from the validation stream, the stream contains validators of all networks.

Motivation

Explorers, hosting tools, etc. Or anything try to validate data out of this stream will need to figure out which network the node is on.

Solution

Add a network_id field to the validation data returned in the stream of data https://xrpl.org/subscribe.html#validations-stream

Paths Not Taken

Unable to 100% say if the id is present in another hash or it could possibly be derived from something already present.