Tokenizer of text index?

Hi there,
I am new to MongoDB and have a question regarding the text index and full-text search.
Have experience with Elasticsearch but would like to know what’s the approach in MongoDB under the hood.
What will be the “term”, “token” if we try to index IPv4 address?
e.g. IP address ->
After tokenization completed by MongoDB, will it be
#1 “10”, “205”, “51”, “45” or
#2 “102055145” or something else?

And where can I check these tokens?

Looking forward to any feedback.