obtain cluster label on data

I am reading ieee paper and in that k mean clustering is applied on ip address which is n*4 in size. I applied k mean clustering on data in matlab with 3 clusters and obtain cluster centers. In paper they mentioned that for each unique ip address p , they obtain cluster label k(p). so how to obtain cluster label for ip address.

I attached ip address data file and paper. in paper it is mentioned in 2nd page which I highlighted in yellow color.

Answer 1

[Massimo Zanetti]

If you applied kmeans function like this:

idx = kmeans(X,k)

then idx is the vector containing the labels.