---
title: "Updating Hosts File on Mac"
type: "knowledge"
post_id: "5236"
slug: "updating-hosts-file-on-mac"
canonical: "https://kb.easydns.com/knowledge/updating-hosts-file-on-mac/"
markdown_url: "https://kb.easydns.com/knowledge/updating-hosts-file-on-mac.md"
json_url: "https://kb.easydns.com/knowledge/updating-hosts-file-on-mac.json"
txt_url: "https://kb.easydns.com/knowledge/updating-hosts-file-on-mac.txt"
published: "2024-11-09T20:03:25+00:00"
modified: "2024-11-09T20:03:25+00:00"
author: "ryan"
categories:
tags:
site_name: "easyDNS Knowledge Base"
publisher: "easyDNS Technologies Inc."
language: "en-US"
generator: "easyPress Markdown"
generator_version: "1.0.6"
---
How to Update the Hosts File on a Mac Using Terminal
====================================================
The hosts file allows you to map specific domain names to IP addresses, which can be useful for testing or blocking certain websites. Below is a step-by-step guide on how to update the hosts file on a Mac using the Terminal.
---
Step 1: Open the Terminal
-------------------------
1. **Launch Terminal**: Open the Terminal application by going to **Finder > Applications > Utilities > Terminal**.
- Alternatively, open **Spotlight** by pressing **Command + Space**, type **Terminal**, and hit **Enter**.
Step 2: Open the Hosts File in a Text Editor
--------------------------------------------
In the Terminal window, type the following command to open the hosts file in the Nano text editor:
```bash
sudo nano /etc/hosts
```
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- **Explanation**:
- `sudo` grants you superuser privileges needed to edit system files.
- `nano` is a simple command-line text editor.
- `/etc/hosts` is the path to the hosts file on a Mac.
- **Note**: You will be prompted to enter your **administrator password**. Type it in and press **Enter** (the password won’t be visible as you type for security reasons).
Step 3: Edit the Hosts File
---------------------------
Once you’re in the Nano editor, you’ll see the contents of the hosts file. It may look something like this:
```
##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting. Do not change this entry.
##
127.0.0.1 localhost
255.255.255.255 broadcasthost
::1 localhost
```
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To add a new entry, scroll to the end of the file using the arrow keys and enter your custom mapping in the following format:
```
[IP Address] [Domain Name]
```
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**Example:**
If you want `example.com` to point to `192.168.1.1`, you would add:
```
192.168.1.1 example.com
```
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You can add multiple mappings if needed:
```
192.168.1.1 example.com
192.168.1.2 test.com
```
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Step 4: Save Your Changes
-------------------------
To save your changes in Nano:
1. **Press `Control + O`** (the letter “O” for output).
2. You’ll be prompted to confirm the file name. **Press Enter** to save without changing the file name.
3. **Press `Control + X`** to exit Nano.
Step 5: Flush the DNS Cache
---------------------------
For the changes to take effect, you need to flush the DNS cache on your Mac. In the Terminal, type the following command:
```bash
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
```
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**Explanation**:
- This command clears the DNS cache, ensuring your system recognizes the new hosts file entries immediately.
Step 6: Test Your Changes
-------------------------
You can test if the hosts file update was successful by trying to ping the domain name you modified.
1. In Terminal, type: ```bash
ping example.com
```
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2. The output should show that `example.com` is being resolved to the IP address you specified in the hosts file. **Example Output**:
```
PING example.com (192.168.1.1): 56 data bytes
64 bytes from 192.168.1.1: icmp_seq=0 ttl=64 time=0.036 ms
```
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Reverting Changes (Optional)
----------------------------
If you need to remove or modify an entry, simply repeat **Steps 1 to 4**, delete or edit the line in the hosts file, and save your changes.
---
Suggested Screenshots
---------------------
While performing each step, it’s helpful to have screenshots to guide users visually. Here are some suggested screenshots:
1. **Opening Terminal**: Screenshot showing Terminal in Finder or Spotlight search.
2. **Opening Hosts File with Nano**: Screenshot of the Terminal with `sudo nano /etc/hosts` typed.
3. **Editing the Hosts File**: Screenshot of the Nano editor showing the hosts file with sample entries added.
4. **Flushing the DNS Cache**: Screenshot of the Terminal with the DNS flush command typed.
5. **Testing with Ping**: Screenshot showing the `ping` command with the output resolving to the modified IP address.
---
By following these steps, you can easily update the hosts file on your Mac. Just remember to proceed with caution, as improper changes to system files can affect your computer’s networking behavior.