Skype IP resolvers are pretty annoying and also go hand and hand with stressers, and no one likes being hit offline, so I'm going to show you how to block the possibility of being resolved.
Step 1:
Go to tools ---> Options ---> Advanced ---> Connection
Step 2:
Copy these settings as shown.
Step 3:
Save and restart Skype, that's all you have to do.
Step 1:
Go to tools ---> Options ---> Advanced ---> Connection
Step 2:
Copy these settings as shown.

Step 3:
Save and restart Skype, that's all you have to do.