diff --git a/README.md b/README.md
index 3c22753..53bbd96 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,9 @@ go build
 // config.yml
 shodan:
   key: String (Required)
+  ports:
+    - 80
+    - 443
 
 // do not forget to set up kafka and create the topic
 kafka:
diff --git a/main.go b/main.go
index 84bacb3..594a5cb 100644
--- a/main.go
+++ b/main.go
@@ -116,7 +116,7 @@ func main() {
 	// shodan
 	client := shodan.NewEnvClient(nil)
 	ch := make(chan *shodan.HostData)
-	err = client.GetBannersByPorts(context.Background(), []int{80, 443, 8443, 53}, ch)
+	err = client.GetBannersByPorts(context.Background(), viper.GetIntSlice("shodan.ports"), ch)
 	if err != nil {
 		logrus.Panic(err)
 	}