If you are not a network engineer having to deal with IP adresses and IP networks (like me), you might be interested by this post.
I recently discovered a very convenient Python module called ipaddress. It's a no-brainer for common questions.
- Is an IP address part of a network?
from ipaddress import ip_address, ip_network
ip_address("192.168.0.16") in ip_network("192.168.0.0/28")
# False
- Is a network a subnet of another network?
ip_network("192.168.0.0/28").subnet_of(ip_network("192.168.0.0/22"))
# True
- How many ip addresses is there in a network?
ip_network("192.168.0.0/22").num_addresses
# 1024
# I know also the formulae 2^(32-n)
2 ** (32-22)
# 1024