Distinct first two octets (/16 networks) count should be retrievable
AD-SUB-09InfoActive DirectorySites and subnets
Part of Active Directory · Active Directory · Sites and subnets · All checks
Invoke-Maester -TestId AD-SUB-09Overview
Section titled “Overview”Understanding /16 network distribution helps:
- Network planning: Identify how many major network blocks are in use
- Segmentation analysis: Understand logical network boundaries
- Capacity assessment: Determine available /16 networks
- Documentation: Support network architecture documentation
Each /16 represents a major network segment (65,534 hosts).
Control Type
Section titled “Control Type”Operational
Security Recommendation
Section titled “Security Recommendation”- Document the purpose of each /16 network block
- Plan /16 allocation to support organizational structure
- Reserve /16 blocks for future expansion
- Review /16 utilization during network planning
How the Test Works
Section titled “How the Test Works”This test extracts the first two octets from all IPv4 subnets and counts the distinct /16 networks.
Related Tests
Section titled “Related Tests”Test-MtAdSubnetFirstOctetCount- Analyzes first octetsTest-MtAdSubnetFirstThreeOctetsCount- Analyzes /24 networksTest-MtAdSubnetTotalCount- Counts total subnets
Details
Section titled “Details”Every attribute of this check
| Field | Value |
|---|---|
| Test ID | AD-SUB-09 |
| 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-MtAdSubnetFirstTwoOctetsCount |
| Services | ActiveDirectory |
| Permissions | ActiveDirectory:Ldap:subnet:ReadProperty |
Source
Section titled “Source”- Test:
tests/ad/site/Test.AD-SUB-09.ps1 - Documentation:
tests/ad/site/Test.AD-SUB-09.md