/17 veya /16 yı kullanabilirsiniz.

https://www.dan.me.uk/ipsubnets?ip=168.192.0.0

CIDR block
168.192.0.0/17

IP range
168.192.0.0 - 168.192.127.255

subnet Mask
255.255.128.0

Toplam IP Adeti
32768