> ## Documentation Index
> Fetch the complete documentation index at: https://docs.box.com/llms.txt
> Use this file to discover all available pages before exploring further.

# About Shield Lists

<div className="article_labels_list" style={{display: 'none'}} dangerouslySetInnerHTML={{__html: "Overview , Admin , Box Shield , Article , New , Rollout"}} />

For customizing Threat Detection and Smart Access, Box Shield enables you to create Shield lists, which are lists of locations, domains, integrations, host IP addresses, or email addresses that you can later either include in or exclude from your threat detection rules.

The Shield list page shows you the following information about each Shield list:

* List name
* When the list was last modified
* The type of list
* How many items are in the list
* How many rules and policies use the list

You can use Shield lists as an allowlist or denylist when defining detection rules in [Threat Detection](/en/box-shield/shield-threat-detection-rules/using-threat-detection) or restrictions in [Smart Access](/en/box-shield/shield-smart-access-policies/about-smart-access), as shown in the following table:

| List Type       | Usage                                               |
| --------------- | --------------------------------------------------- |
| Locations       | Detection rules: Suspicious location                |
| Domains         | Access policies: External collaboration restriction |
| Integration     | Access policies: Integration restriction            |
| IP addresses    | Detection rules: Suspicious location                |
| Email addresses | Access policies: External collaboration restriction |

## Shield List Limits

The following table shows the number of Shield list limits in an enterprise:

| Item                                    | Limit     |
| --------------------------------------- | --------- |
| Number of items in a single Shield List | 10,000    |
| Number of lists in an enterprise        | 100       |
| Max items in all lists in an enterprise | 1,000,000 |
| Number of Shield Lists per policy       | 20        |

### See Also

* [Creating a Shield List](/en/box-shield/shield-lists/creating-a-shield-list)
* [Editing a Shield List](/en/box-shield/shield-lists/editing-a-shield-list)
* [Deleting a Shield List](/en/box-shield/shield-lists/deleting-a-shield-list)