# Subnets without site associations count should be retrievable

Subnets without site associations count should be retrievable. A Maester check for Active Directory, Sites and subnets.

Source: https://maester.dev/docs/tests/AD-SUB-11

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<div class="test-byline"><div class="test-byline-avatars"><a class="test-byline-avatar test-byline-avatar--author" href="/contributors/soulemike" title="Michael Soule · Original author"><img src="https://github.com/soulemike.png" alt="Michael Soule" width="28" height="28" loading="lazy" decoding="async" /></a></div><div class="test-byline-meta"><span class="test-byline-text">Contributed by <a href="/contributors/soulemike">Michael Soule</a></span><a class="test-byline-link" href="/contributors">All contributors →</a></div></div>

<p class="test-part">Part of <a href="/docs/tests/ad">Active Directory</a> · Active Directory · Sites and subnets · <a href="/docs/tests">All checks</a></p>

```powershell title="Run this check"
Invoke-Maester -TestId AD-SUB-11
```

## Overview

Subnets without site associations (orphaned subnets) can cause:

- **Client mislocation**: Computers with these IPs cannot determine their site
- **Authentication inefficiency**: Clients may authenticate to distant DCs
- **Configuration drift**: Orphaned subnets may indicate incomplete cleanup
- **Operational confusion**: Unclear which locations these subnets serve

Orphaned subnets should be either assigned to sites or removed.

#### Control Type

**Operational**

#### Security Recommendation

- Assign orphaned subnets to appropriate sites
- Remove subnets that are no longer in use
- Review subnet assignments during network changes
- Document the purpose and location of all subnets

#### How the Test Works

This test identifies subnets that have no site association (SiteObject is null).

#### Related Tests

- `Test-MtAdSiteWithoutSubnetCount` - Identifies sites without subnets
- `Test-MtAdSubnetSiteAssociationCount` - Counts sites with subnets
- `Test-MtAdSubnetTotalCount` - Counts total subnets

## Details

<details>
<summary>Every attribute of this check</summary>

| Field | Value |
| --- | --- |
| Test ID | AD-SUB-11 |
| Severity | Info |
| Suite | Active Directory |
| Product | Active Directory |
| Feature | Sites and subnets |
| Area | Infrastructure hardening |
| Resource type | AdSite |
| MITRE ATT&CK | None |
| PowerShell test | [Test-MtAdSubnetWithoutSiteCount](https://github.com/maester365/maester/blob/main/tests/ad/site/Test.AD-SUB-11.ps1) |
| Services | ActiveDirectory |
| Permissions | ActiveDirectory:Ldap:subnet:ReadProperty |

</details>

## Source

- Test: [`tests/ad/site/Test.AD-SUB-11.ps1`](https://github.com/maester365/maester/blob/main/tests/ad/site/Test.AD-SUB-11.ps1)
- Documentation: [`tests/ad/site/Test.AD-SUB-11.md`](https://github.com/maester365/maester/blob/main/tests/ad/site/Test.AD-SUB-11.md)