Tools, Converters, and Calculators

Cloud Tools and Tutorials

AWS EC2 Instance Type Finder
Azure VM Size Finder
GCP VM Type Finder

Terraform Tutorials:
Handling Terraform State in Multi-Environment Deployments
Understanding Terraform Variable Precedence
Terraform Value Types Tutorial
Terraform count Explained with Practical Examples
Terraform for_each Tutorial with Practical Examples
Exploring Terraform dynamic Blocks with GCP Examples
Working with External Data in Terraform
Handling Sensitive and Ephemeral Data in Terraform
Working with Existing Infrastructure Using Terraform Import
Terraform Modules FAQ

Cost / Licensing Calculators

AWS EC2 Price Comparison Tool
Azure VM Price Comparison Tool
GCP VM Price Comparison Tool
Windows Server Licensing Calculator
Microsoft SQL Server Enterprise Edition Licensing Calculator
Microsoft SQL Server Standard Edition Licensing Calculator
RHEL Subscription Calculator
Virtualization Cost Calculator
Virtualization Cost Comparison
VMware Licensing Calculator
VMware Product and Licensing Changes

Domains & DNS

DNS Lookup
DNS Propagation Checker
DNS Report Generator
DNS Trace Tool
DNSSEC Report
EDNS Client Subnet Checker
Punycode / IDN Converter
WHOIS Lookup for IPs and domains
Whois servers for TLDs and ccTLDs

EMail

DKIM Record Generator
DKIM Record Lookup
DMARC Record Generator
DMARC Record Lookup
Email Header Analyzer
MX Record Lookup
RBL Record Checker
SPF Record Generator
SPF Record Lookup

Miscellaneous

Binary to Decimal to Hexadecimal Converter
Diceware Passphrase Generator - simplifies and speeds up the process of generating passphrases with the length between 5 and 10 words.
Ethernet MAC Address Lookup / Fibre Channel WWN, WWPN, WWNN Lookup / Vendor Lookup
Gigabyte (GB) to Gibibyte (GiB) Converter - provides quick conversion between gibibyte (2³⁰ bytes), mebibyte (2²⁰ bytes), gigabyte (10⁹ bytes), and megabyte (10⁶ bytes).
Random Password Generator - generates passwords from 7 to 24 characters long with a random distribution of lower-case characters, upper-case characters, digits, and non-alphanumeric characters.
Tethering - how to tether (interconnect) a mobile phone and a laptop, PC, or tablet in order to share phone's Internet connection.
TLD and CLTLD whois servers list

Network

Autonomous System (ASN) Lookup
Bulk MAC Address Lookup
Bulk Tor Exit Node Checker
Data Transfer Rate Converter
DNS Lookup
DNS Propagation Checker
DNS Report Generator
DNS Trace Tool
DNSSEC Report
EDNS Client Subnet Checker
EMail Header Analyzer - analyzes email headers and presents basic information about an email massage in an easy to read table form.
Expressing IPv6 Addresses with Words
File Transfer Time Calculator
How to add MAC address to wireless router
How to find MAC address
IP Address and Subnet Mask Visual Calculator
IP Lookup/Geo-Locator - finds the geographical location of an IP address or host.
IP Subnet Calculator
IPv6 Addressing Cheat Sheet
IPv6 Calculator
MAC Address Lookup / Fibre Channel WWN, WWPN, WWNN Lookup / Vendor Lookup
Network Throughput Calculator
Subnet Mask Table
Tethering - how to tether (interconnect) a mobile phone and a laptop, PC, or tablet in order to share phone's Internet connection.
WAN Latency Estimator
What is my IP address - displays connected computer's IP address, host name and other details obtained from user agent string.
WHOIS Lookup for IPs and domains.

SAN / Storage

Ethernet MAC Address Lookup / Fibre Channel WWN, WWPN, WWNN Lookup / Vendor Lookup
Gigabyte (GB) to Gibibyte (GiB) Converter - provides quick conversion between gibibyte (2³⁰ bytes), mebibyte (2²⁰ bytes), gigabyte (10⁹ bytes), and megabyte (10⁶ bytes).
TB / TiB / GB / GiB Converter
RAID Types Overview - review of the most common RAID types and their characteristics.
RAID Capacity Calculator - computes array capacity and other characteristics based on the the RAID level, the number of disks, and disk capacity.
RAID Capacity Calculator (ZFS)
RAID Capacity Calculator (NetApp)
RAID Performance Calculator
RAID Performance Calculator (SSD)
RAID Sizing Tool - allows to generate and compare configurations for two RAID systems based on the provided performance and/or capacity requirements, RAID levels, IO patterns, and disk specifications. Supported RAID levels are RAID0, RAID1, RAID5, RAID6, RAID10 (1+0).
RAID Reliability Calculator - computes storage system reliability using well-known MTTDL methodology. Supported RAID levels are RAID 5, RAID 6 / RAID-DP, RAID 10 (1+0).
SSD Endurance - DWPD, TBW, TBW, GB/day Calculator
SSD Endurance - Useful Life Calculator
IOPS, MB/s, GB/day Converter
Backup Calculator
How to find WWN
How to clear SCSI reservation on a LUN
Clariion NaviSecCLI Cheat Sheet
Hard Disk Performance Basics
Simple disk throughput tests using dd utility

Virtualization

vSphere ESXi - calculates the number of hosts in a vSphere ESXi cluster based on the planned VM workload and host configuration.
Hyper-V - evaluates the number of hosts in a Hyper-V cluster for given legacy server workload and host specification.
VM Storage Calculator
Virtualization Cost Calculator
Virtualization Cost Comparison
VMware Licensing Calculator

UNIX / Linux

I've just installed CentOS 6! Now what? - CentOS Initial Set up and Configuration
File Mode Creation Mask / umask Calculator
Unix Permissions / chmod Calculator
Crontab expression generator
RHEL Subscription Calculator

Web and Text Tools

Base64 Encoder / Decoder
HTML Character Code Lookup
RGB Color Converter
ROT13 Coder - ROT13 and ROT47 (rotating substitution ciphers) encoder / decoder.
Unicode Character Lookup
URL Blacklist Checker
URL Encoder / Decoder
URL Redirection Checker

Other Stuff

Despair, Inc.
XKCD