Why do we use private IP addresses?

 

Private IP addresses offer numerous benefits to end users and network administrators alike. They provide additional security to end users while accessing resources on the Internet. They also help with scalability and administration concerns in Ball State's large Ethernet network.


Common questions asked about Public vs. Private IP addressing

1. What are public and private IP address?

A public IP address is any IP address that is accessible via the Internet and a private IP address is any address that cannot be accessed via the Internet. However, there are only certain ranges of IP addresses that are reserved as private IP addresses. For a device with a private address to communicate to a device on the Internet, the private IP address needs to be translated to a public IP address. This is often referred to as NAT or Network Address Translation. This allows organizations like Ball State to use private IP addresses internally and then translate the private address to a public address when it travels onto the Internet.

2. How do I know if my IP address is private?

Any IP address in the following ranges is considered to be private:
10.0.0.0 - 10.255.255.255
127.0.0.0 127.255.255.255
169.254.0.0 169.254.255.255
172.16.0.0-172.31.255.255
192.168.0.0 - 192.168.255.255

3. When did Ball State start using private IP addresses?

Ball State switched to private IP addressing during the 2000-2001 academic year.

4.  What are the advantages to using private IP addresses as opposed to public addresses.

Private IP addresses help network administrators efficiently design the campus network to reduce load on the routers used across campus. It also provides security for end users due to the translation between public and private IP addresses when communicating to devices on the Internet.

5. How many public and private IP addresses does Ball State have?

Ball State has been allocated 65,536 addresses for use on the Internet and we have over 16 million private addresses at our disposal for use on the internal campus network.