Update 9th of January 2020

This post was written many years ago, when I was installing CentOS minimal, after several years I am surprised that this post is still being viewed.
As recommended below in the comments, there is no need to use net-tools anymore, this package has already been deprecated although still exists in the yum repository but there will be no more updates meaning any available bugs or vulnerabilities will not be fixed and maintained.

Use ss instead of netstat, use ip addr show dev enp0s3 instead of ifconfig enp0s3, so instead of netstat -rn use ip route.

On newly installed minimal installation the interface may not have automatically obtain ip address from dhcp server, use dhclient enp0s3 then to easily make it always obtain ip address download the NetworkManager’s nmtui. Refer to this post.

You have the freedom of choice which is why the old net-tools package is still in yum repo, I do not see it a must to use the new method, use what is comfortable for you.

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I have just installed Centos 7 with the minimal installation options, lots of things which were taken for granted by me were not installed, one of them is netstat.

In the repo there is no software package that names as netstat.
To find out netstat is by which software package.

yum whatprovides netstat
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: centos.mirror.secureax.com
 * extras: centos.mirror.secureax.com
 * updates: centos.mirror.secureax.com
net-tools-2.0-0.17.20131004git.el7.x86_64 : Basic networking tools
Repo        : @base
Matched from:
Filename    : /usr/bin/netstat

So netstat is part of a software in the package known as net-tools.

To install net-tools:

[anything@SQUID ~]$ sudo yum install net-tools
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: centos.mirror.secureax.com
 * extras: centos.mirror.secureax.com
 * updates: centos.mirror.secureax.com
Resolving Dependencies
--> Running transaction check
---> Package net-tools.x86_64 0:2.0-0.17.20131004git.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package         Arch         Version                          Repository  Size
================================================================================
Installing:
 net-tools       x86_64       2.0-0.17.20131004git.el7         base       304 k

Transaction Summary
================================================================================
Install  1 Package

Total download size: 304 k
Installed size: 917 k
Is this ok [y/d/N]: y
Downloading packages:
net-tools-2.0-0.17.20131004git.el7.x86_64.rpm              | 304 kB   00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : net-tools-2.0-0.17.20131004git.el7.x86_64                    1/1
  Verifying  : net-tools-2.0-0.17.20131004git.el7.x86_64                    1/1

Installed:
  net-tools.x86_64 0:2.0-0.17.20131004git.el7

Complete!