ifconfig has been deprecated in favour of the ip utility for many years and was removed in RHEL/CentOS 7. Being a creature of habit, I choose to install it anyway so when I reach for it I don't waste time realizing and correcting my mistake. It is available in the net-misc package:

dnf install net-misc

As of CentOS Stream 9 the package is now named net-tools:

dnf install net-tools