Tools
Small calculators and converters I find useful in infrastructure work. They run in your browser and nothing you type is sent anywhere.
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Servers and licensing
2 tools
Cloud and Azure
4 tools
- Azure VNet and subnet calculatorCalculate Azure subnets accounting for Azure's 5 reserved IP addresses and service size requirements.
- Azure VM family and sizing advisorRecommend Azure VM series, vCPU-to-RAM ratios and disk limits for enterprise and cloud workloads.
- Cloud migration and Azure Data Box calculatorModel online transfer time vs. offline Azure Data Box appliances based on dataset size, bandwidth and daily churn.
- Storage IOPS and throughput calculatorConvert between IOPS, block size (KB), throughput (MB/s) and queue depth for Azure disks and VMware.
Security and identity
5 tools
- Password and GUID generatorRandom passwords and GUIDs made with your browser's secure random generator.
- Active Directory LDAP query builderGenerate exact LDAP filter queries for Active Directory, Entra Domain Services and PowerShell Get-ADUser.
- SPF and DMARC record builderGenerate valid SPF and DMARC TXT DNS records for Microsoft 365, Google Workspace, hybrid and mailers.
- Certificate decoderPaste a PEM certificate to see its subject, alternative names, dates, key size, usages and thumbprints.
- CSR decoderPaste a certificate signing request to check its subject, requested names, key size and signature before you send it.
Network and capacity
7 tools
- Common port numbersSearch well-known TCP and UDP ports by number, service or purpose: Windows, AD, email, VPN, databases and VMware.
- Subnet calculatorNetwork, broadcast, mask and usable host range for any IPv4 address and prefix.
- CIDR mergerJoin a list of IPv4 subnets, addresses and ranges into the smallest set of CIDR blocks.
- TCP throughput calculatorThe real speed a TCP connection reaches for a given link, delay, window size and packet loss.
- Data transfer timeHow long a migration copy takes for a given data size, link speed and efficiency.
- RAID capacity calculatorUsable capacity and fault tolerance for RAID 0, 1, 5, 6 and 10.
- SLA downtime calculatorHow much downtime an availability target such as 99.9 percent really allows.
Converters
3 tools
Time and scheduling
2 tools
Pick a tool from the list and it opens here, so you can use it without leaving this page.
Every tool runs in your browser. Nothing you type is sent to the server. Each tool page has a pop-out button to keep it in a small window.