Technology Support Center

Administrative Technologies

How to release and renew an IP address in Mac OS X 10.4 and 10.3

To verify that you have connectivity, release and renew your IP address. Obtaining an IP address is the first step to network connectivity.

Determine Your IP Address

To determine your IP address in Mac OS X 10.4 and 10.3, do the following:

  1. Click the Apple icon and select System Preferences....
  2. Click Network.
  3. Locate the area labeled Built-in Ethernet; your IP address is displayed in the description to the right. Once you have determined your IP address, refer to the information below.
  • 10. (example: 10.1.1.2) — An IP address that begins with 10. has full access to the campus network and the Internet.
  • 172. (example: 172.254.1.2) — An IP address that begins with 172. has restricted access to the campus network and cannot access the Internet.
  • 192.168. (example: 192.168.1.2) — An IP address that begins with 192.168. is typically assigned by a personal router. Depending on your home or private network, you may or may not have access to the Internet.
  • 169.254. (example: 169.254.1.2) — If you have a 169.254. IP address, it means your computer is unable to obtain a valid IP address from the network. You may attempt to obtain a valid IP address by releasing and renewing.
  • 0.0.0.0 — If your IP address is 0.0.0.0, it means your computer currently has no IP address. You may attempt to obtain a valid IP address by renewing.
  • Other (example: any other IP address) — If you have another IP address listed, it may be one you obtained from your Internet Service Provider (ISP). Or, it might be a static IP address configure in your computer's network settings.

Release and Renew Your IP Address

To release and renew your IP address on Mac OS X 10.4 and 10.3, do the following:

  1. Click the Apple icon and select System Preferences....
  2. Click Network.
  3. Select Built-in Ethernet and click Configure.
  4. Click Renew DHCP Lease.
  5. Your computer will attempt to obtain a new IP address from the network. This may take a few minutes. If this process is successful, you will see your new IP address.

There are a few reasons why your computer might fail to obtain a new IP address.

  • Your computer may not be configured for DHCP.
  • There may be a physical problem (i.e. bad network port, bad Ethernet cable, etc.).
  • There may be a problem with the DHCP server.