# Computer DNS zone details should be investigated

Security and Operational Value: - Topology Mapping: Understand how computers are distributed across DNS domains - Disjoint Namespace Detection: Identify…

Source: https://maester.dev/docs/tests/AD-DCOMP-09

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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 · Computers · <a href="/docs/tests">All checks</a></p>

```powershell title="Run this check"
Invoke-Maester -TestId AD-DCOMP-09
```

## Overview

- Detailed analysis of DNS zone distribution provides visibility into Active Directory topology and helps identify potential configuration issues or security concerns related to DNS.

**Security and Operational Value:**
- **Topology Mapping**: Understand how computers are distributed across DNS domains
- **Disjoint Namespace Detection**: Identify computers in unexpected DNS zones
- **Configuration Validation**: Verify computers are in appropriate zones
- **Compliance Verification**: Ensure DNS configuration meets organizational standards

**Potential Issues Identified:**
- Computers in incorrect DNS zones
- Disjoint namespace misconfigurations
- Orphaned computer accounts
- DNS registration failures

#### Control Type

**Operational**

#### Security Recommendation

1. **Zone Assignment Review**:
   - Verify computers are in appropriate DNS zones
   - Investigate computers in unexpected zones
   - Document legitimate multi-zone scenarios

2. **DNS Configuration Audit**:
   - Regular review of DNS zone configuration
   - Validate DNS delegation settings
   - Check for stale or orphaned records

3. **Remediation**:
   - Move computers to correct zones if misconfigured
   - Delete stale computer accounts
   - Fix DNS registration issues

#### How the Test Works

This test provides detailed analysis:
- Breakdown of computers by DNS zone
- Counts per zone with percentages
- List of computers without DNS host names
- Distribution statistics

#### Related Tests

- `Test-MtAdComputerDnsZoneCount` - DNS zone count summary
- `Test-MtAdComputerDnsHostNameCount` - DNS host name coverage
- `Test-MtAdAllowedDnsSuffixesCount` - DNS suffix configuration

## Details

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

| Field | Value |
| --- | --- |
| Test ID | AD-DCOMP-09 |
| Severity | Info |
| Suite | Active Directory |
| Product | Active Directory |
| Feature | Computers |
| Area | Infrastructure hardening |
| Resource type | DnsZone |
| MITRE ATT&CK | None |
| PowerShell test | [Test-MtAdComputerDnsZoneDetails](https://github.com/maester365/maester/blob/main/tests/ad/security/Test.AD-DCOMP-09.ps1) |
| Services | ActiveDirectory |
| Permissions | ActiveDirectory:Ldap:computer:ReadProperty |

</details>

## Source

- Test: [`tests/ad/security/Test.AD-DCOMP-09.ps1`](https://github.com/maester365/maester/blob/main/tests/ad/security/Test.AD-DCOMP-09.ps1)
- Documentation: [`tests/ad/security/Test.AD-DCOMP-09.md`](https://github.com/maester365/maester/blob/main/tests/ad/security/Test.AD-DCOMP-09.md)