IP 許可リストを使用して Enterprise へのネットワーク トラフィックを制限する

About network traffic restrictions

By default, authorized users can access your enterprise from any IP address. You can restrict access to resources by configuring an allow list for specific IP addresses. For example, you can allow access from only the IP address of your office network. The allow list for IP addresses will block access to private resources via the web, API, and Git from any IP addresses that are not on the allow list.

Any navigation to resources protected by an IP allow list will be filtered by the list, including through:

• Username and password with GitHub authentication or SAML SSO
• Personal access token
• SSH keys

All user credentials, including those belonging to administrators, are subject to IP allow list checks. IP allow lists are not enforced on traffic directed to public repositories.

By default, Azure network security group (NSG) rules leave all inbound traffic open on ports 22, 80, 443, and 25. You can contact GitHub Support to configure access restrictions for GitHub AE.

For restrictions using Azure NSGs, contact GitHub Support with the IP addresses that should be allowed to access GitHub AE. Specify address ranges using the standard CIDR (Classless Inter-Domain Routing) format. GitHub Support will configure the appropriate firewall rules to restrict network access over HTTP, SSH, HTTPS, and SMTP. For more information, see "Receiving help from GitHub Support."

Enabling allowed IP addresses

After you create an IP allow list, you can enable allowed IP addresses. When you enable allowed IP addresses, GitHub immediately enforces any enabled entries in your IP allow list.

Before you enable your IP allow list, you can check whether your allow list will permit a connection from a particular IP address. For more information, see "Checking if an IP address is permitted."

1. In the top-right corner of GitHub AE, click your profile photo, then click Enterprise settings.

2. In the enterprise account sidebar, click Settings.

3. In the left sidebar, click Security.

4. Under "IP allow list", select Enable IP allow list.

5. Click Save.

Adding an allowed IP address

You can create an IP allow list by adding entries that each contain an IP address or address range. After you finish adding entries, you can check whether a particular IP address would be allowed by any of the enabled entries in your list.

Before the list restricts access to your enterprise, you must also enable allowed IP addresses.

1. In the top-right corner of GitHub AE, click your profile photo, then click Enterprise settings.

2. In the enterprise account sidebar, click Settings.

3. In the left sidebar, click Security.

4. At the bottom of the "IP allow list" section, enter an IP address, or a range of addresses in CIDR notation.

5. Optionally, enter a description of the allowed IP address or range.

6. Click Add.

7. Optionally, check if a particular IP address would be allowed by any of the enabled entries in your list. For more information, see "Checking if an IP address is permitted."

Allowing access by GitHub Apps

If you're using an allow list, you can also choose to automatically add to your allow list any IP addresses configured for GitHub Apps that are installed in your enterprise.

If you select Enable IP allow list configuration for installed GitHub Apps in your allow list settings, then IP addresses from installed GitHub Apps are added to your allow list. This happens irrespective of whether your allow list is currently enabled. If you install a GitHub App and then the creator of that application changes the addresses in its allow list, your allow list is automatically updated with those changes.

You can identify the IP addresses that have been automatically added from GitHub Apps by reviewing the description field. The description for these IP addresses is: "Managed by the NAME GitHub App." Unlike addresses you add manually, you cannot edit, delete, or disable IP addresses that are automatically added from GitHub Apps.

For more information about how to create an allow list for a GitHub App you have created, see "Managing allowed IP addresses for a GitHub App."

To enable automatic addition of IP addresses for GitHub Apps:

1. In the top-right corner of GitHub AE, click your profile photo, then click Enterprise settings.

2. In the enterprise account sidebar, click Settings.

3. In the left sidebar, click Security.

4. Select Enable IP allow list configuration for installed GitHub Apps. If you are using Enterprise Managed Users with OIDC, first select GitHub as your IP allow list configuration, then select Enable IP allow list configuration for installed GitHub Apps.

5. Click Save.

Editing an allowed IP address

You can edit an entry in your IP allow list. If you edit an enabled entry, changes are enforced immediately.

After you finish editing entries, you can check whether your allow list will permit a connection from a particular IP address after you enable the list.

1. In the top-right corner of GitHub AE, click your profile photo, then click Enterprise settings.

2. In the enterprise account sidebar, click Settings.

3. In the left sidebar, click Security.

4. Under "IP allow list", to the right of the entry you want to edit, click Edit.

5. Type an IP address, or range of addresses, in CIDR notation.

6. Type a description of the allowed IP address or range.

7. Click Update.

8. Optionally, check if a particular IP address would be allowed by any of the enabled entries in your list. For more information, see "Checking if an IP address is permitted."

Checking if an IP address is permitted

You can check whether a particular IP address would be allowed by any of the enabled entries in your IP allow list, even if the list is not currently enabled.

1. In the top-right corner of GitHub AE, click your profile photo, then click Enterprise settings.

2. In the enterprise account sidebar, click Settings.

3. In the left sidebar, click Security.

4. Under "Check IP address", enter an IP address.

Deleting an allowed IP address

1. In the top-right corner of GitHub AE, click your profile photo, then click Enterprise settings.

2. In the enterprise account sidebar, click Settings.

3. In the left sidebar, click Security.

4. Under "IP allow list", to the right of the entry you want to delete, click Delete.

5. To permanently delete the entry, click Yes, delete this IP allow list entry.

Using GitHub Actions with an IP allow list

To allow your self-hosted runners to communicate with GitHub, add the IP address or IP address range of your self-hosted runners to the IP allow list. For more information, see "Adding an allowed IP address."