Unknown device on my network

So i just rest my Wi-Fi password and i log my phone back into the Wi-Fi go to the Wi-Fi settings add ps4 and the name changed to AzureWave device so i go into my settings and block it . had my ps4 on YouTube app . my phone can link to the ps4 YouTube app thu my phones YouTube app . when i did shut it off , it logged me out of YouTube on ps4. but ps4 still had internet access did not show up on wifi scan . weird hope it help someone