Here are the 2 methods you can find the MAC and IP addresses of a Galaxy S4:
a. via the Wi-Fi settings
- On your phone, go to home Settings > Connections > Wi-Fi > tab the Menu button > Advanced.
- Scroll to the bottom, you’ll see the MAC and IP (If your phone is connected) addresses.
b. via the About device screen
- On your phone, go to home Settings > More > About device > Status.
- Scroll down to the IP address and Wi-Fi MAC address fields.
Note: The steps here were written for Android 4.3 on a Samsung Galaxy S4 (GT-I9500). If you’re having a different model of Galaxy S4 or other version of Android, there’s a possibility that the steps and screenshots will be different.