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Here's how to Fix Mac hostname changed on public network issue.

i. Your Mac hostname is the name that identifies your Mac on a network. By default, your Mac hostname is its serial number. You can change your Mac hostname in System Preferences.

To change your Mac hostname, follow these steps:

1. Open System Preferences.
2. Click Network.
3. Click the Sharing tab.
4. In the "Computer Name" field, enter a new hostname for your Mac.
5. Click OK.

Your new hostname will take effect immediately.

ii. There are a few ways to hide your Mac hostname:

* **Use a different hostname for each network connection:** You can use a different hostname for each network connection that your Mac is connected to. This will make it more difficult for people to track your Mac across different networks.
* **Use a proxy server:** A proxy server is a server that acts as an intermediary between your Mac and the internet. When you use a proxy server, your Mac's hostname will not be visible to the websites that you visit.
* **Get NordVPN@ https://nordvpn.sjv.io/c/376211/570073/7452:** A VPN is a virtual private network that encrypts your internet traffic and routes it through a server in another location. When you use a VPN, your Mac's hostname will not be visible to anyone on the internet.

It is important to note that hiding your Mac hostname does not make your Mac completely invisible to others. If someone is able to connect to your Mac directly, they will still be able to see your hostname.

iii. Here are a few things you can do to fix Mac hostname not changing:

* **Restart your Mac:** Restarting your Mac will often fix any temporary problems that may be causing your hostname to not change.
* **Check your network settings:** Make sure that your Mac is connected to the correct network and that your network settings are correct.
* **Change your Mac's hostname in System Preferences:** Open System Preferences and click Network. Click the Sharing tab and enter a new hostname for your Mac. Click OK.
* **Run a network diagnostics tool:** A network diagnostics tool can help you to identify any problems with your network connection.
* **Contact your network administrator:** If you are still having problems, contact your network administrator for help.

Learn more@ https://www.youtube.com/c/ITGuides/search?query=mac.