NTP Compliance Validator for CISOs & Enterprise

Audit Mode Selection

Three validation modes for enterprise NTP infrastructure audits — aligned with ISO 27001 A.12.4.4, NIS 2 Art. 21 and PCI-DSS Req. 10.6.

Compliance Time Check

Verify the temporal integrity of your endpoint against RDEM GNSS-disciplined Stratum 1 references — a prerequisite for ISO 27001, NIS 2 and DORA audit trails.

RFC 1918 Internal NTP Audit

Audit NTP servers on private address space (RFC 1918) without exposing them to the public Internet. Required for NIS 2 / ISO 27001 internal infrastructure reviews.

# 1. Download and install
cd /tmp && curl -sL https://online-ntp-validator.com/bridge/ntp-bridge.tar.gz | tar xz
cd ntp-bridge && npm install

# 2. Start the bridge
node server.js
# Bridge running on ws://localhost:8080

# 1. Prerequisites: Node.js (via Homebrew if needed)
brew install node

# 2. Download and install
cd /tmp && curl -sL https://online-ntp-validator.com/bridge/ntp-bridge.tar.gz | tar xz
cd ntp-bridge && npm install

# 3. Start the bridge
node server.js
# Bridge running on ws://localhost:8080

# PowerShell - 1. Prerequisites: Node.js
# Download from https://nodejs.org/

# 2. Download the bridge
Invoke-WebRequest -Uri "https://online-ntp-validator.com/bridge/ntp-bridge.zip" -OutFile "$env:TEMP\ntp-bridge.zip"
Expand-Archive -Path "$env:TEMP\ntp-bridge.zip" -DestinationPath "$env:TEMP\ntp-bridge" -Force
cd "$env:TEMP\ntp-bridge"

# 3. Install and start
npm install
node server.js
# Bridge running on ws://localhost:8080

CLI Auditor Script

Bash script for server-side NTP compliance verification — produces machine-readable output suitable for evidence collection during ISO 27001 and PCI-DSS audits.

# One-liner test
curl -sL https://ntp.rdem-systems.com/ntp-check.sh | bash

# Or download and run
wget https://ntp.rdem-systems.com/ntp-check.sh
chmod +x ntp-check.sh
./ntp-check.sh

NTP Compliance Validation Checklist

Download our 15-point checklist to ensure your NTP infrastructure meets audit requirements:

Not here for a compliance audit? Use the right tool for your use-case:

• Measure jitter, offset, latency → ntp-tester.eu
• Diagnose firewall / port 123 / daemon issues → check-ntp.net
• Enterprise reference architecture → ntp.rdem-systems.com

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About this validator — An independent NTP server accuracy verification tool provided by RDEM Systems. Validation is performed against GNSS/PPS Stratum 1 references on our dedicated infrastructure. We actively contribute to the NTP Pool project →
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