I forgot to mention to create your new subnet mask. Since we started out with 16 network bits and we borrowed 5, we have 21 networks bits (16+5). A /21 is 255.255.248.0 in decimal form.

https://liggliluff.deviantart.com/art/Fluttershy-Raise-Rear-Hoof-286401614

https://atelophobic.deviantart.com/art/Derpy-Hooves-say-wut-353268356