Unable to connect to Zalenium service from my Kubernetes cluster:

I am trying to get the external IP of the zalenium service that I have created via my Kubernetes cluster. I am getting the following :

$ kubectl get services --namespace zalenium
NAME       TYPE       CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE
zalenium   NodePort   172.21.187.0   <none>        80:30190/TCP   58m

Can anyone help me how to get the EXTERNAL-IP please?