Windows · Active Directory · VMware · Networking

Practical tools and guides for system administrators

Command builders, cheat sheets and field-tested guides for the work you actually do on Windows Server, Active Directory and vSphere.

27free tools
26cheat sheets
118guides
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Windows command linerobocopy · reg · schtasks · sfc PowerShellGet-WinEvent · Get-Counter · Base64 Active Directorynltest · dcdiag · DFS · Kerberos VMwareesxcli · PowerCLI · Invoke-VMScript Networking and DNSipconfig · netstat · tracert · nslookup Storage and backupvssadmin · wbadmin · diskpart · mklink Security and accessicacls · runas · certutil · OpenSSL Linuxssh · disks · systemctl · vi
Tools

Run it in the browser, copy the command

All tools
ROBOCOPY command builderBuild a /MIR copy with retries, logging and exclusions without guessing switches.Open tool PowerCLI command builderInventory, snapshot and VM power one-liners for vSphere, ready to paste.Open tool Windows Event Log Analyzer AIPaste an event, get the likely cause and the next command to run.Open tool IP subnet calculatorNetwork, broadcast, host range and mask for any CIDR block.Open tool DNS lookupA, MX, TXT, CNAME and NS records for any domain in one query.Open tool Port checkerIs the TCP port open from the internet, or is the firewall in the way.Open tool nltest command builderDomain controller discovery and secure channel checks, switch by switch.Open tool Windows 11 registry tweaksReady-to-import .reg files for the Windows 11 settings admins change most.Open tool
Cheat sheets

One page per tool, printable

Free PDF packFive cheat sheets, one PDFSubnets, PowerShell, Linux, HTTP codes and ESXi. Free, by email.Get the pack PS> Get-HelpPowerShell commandsPowerShell robocopy /MIR /LRobocopy: flags, filters and exit codesWindows command line Event ID 4625Windows Event IDsWindows /24 = 255.255.255.0Subnet masksNetworking esxcli system version getESXi command lineVMware $ ls -laLinux commandsLinux icacls D:\Share /TNTFS permissions and icaclsSecurity and access openssl x509 -textOpenSSLSecurity and access All cheat sheets
Latest guides

New on the site

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Networking and DNSC:\> domain expiry powershellOct 6, 2026 · GuideCheck a domain expiry date and status from PowerShell with RDAPA domain stops resolving and the first guess is DNS. Often it is not DNS: the registration expired, the registry put a hold on...PowerShellPS> convert filetime to datetimeOct 5, 2026 · GuideConvert FILETIME to DateTime in PowerShell: 1601, 1970 and zeroWindows counts time from 1601, Unix counts it from 1970, and .NET counts its own ticks from the year 1. A file time, the...VMware~ # Copy-VMGuestFileOct 4, 2026 · GuideCopy-VMGuestFile: copying files into a VM with no networkCopy-VMGuestFile is the PowerCLI cmdlet that moves a file between your workstation and the inside of a virtual machine. It does not use the...Windows command lineC:\> winget installOct 3, 2026 · Guidewinget install: exact matching, silent flags and exit codesTyping winget install git into a terminal and watching an installer appear is the whole of most people’s experience of the Windows Package Manager....PowerShellPS> ConvertTo-JsonOct 3, 2026 · GuideConvertTo-Json -Depth: the valid JSON that lost half your configQuick answer ConvertTo-Json turns a PowerShell object into JSON text and ConvertFrom-Json turns JSON text back into an object. Both work in one line....Security and accessC:\> X509ChainOct 2, 2026 · GuideX509Chain: the certificate check that returns False for 25 reasonsA certificate check that answers with a single True or False is almost useless when it says False. The certificate might have expired. The...
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About

Written from real infrastructure work

Hi, I'm Zaur, a system administrator working mainly with Windows infrastructure, VMware, AWS, automation and troubleshooting. This website brings together practical tools, cheat sheets and technical guides based on real-world infrastructure work. The goal is simple: help system administrators solve everyday tasks faster.

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