You can use these calculators to calculate DPI and PPI, domain, IP, hostname, etc. Also convert between data storage and transfer, resolution, and more..
DPI Calculator / PPI Calculator
Calculate DPI and PPI for displays with square pixels.
Computer storage conversion online.
Convert Computer Storage Units Instantly.
Data Storage Conversion Table
Perform batch conversions between data storage units.
Data transfer rate conversion online.
Computer and the Internet connection speed conversion, various common connection methods and protocols (KB/s, baud, ADSL, GPRS, minutes per MB, etc.)
Digital Image Resolution Conversion Table
Perform batch conversions between Digital Image Resolution units.
Free DNS Query and Whois Tools - DNSQuery
Domain Queries, IP Queries, Hostname Queries
IP Calculator / IP Subnetting
ipcalc takes an IP address and netmask and calculates the resulting broadcast, network, Cisco wildcard mask, and host range.
Online Conversion - ASCII Engine
Converts any keyboard character to ASCII Decimal/Hex/binary
Online Conversion - CHMOD Calculator
Calculate different values of Chmod, for Unix and Linux systems.
Online Conversion - Computer memory/hard drive/data conversions
Convert bytes, kilobytes, megabytes, gigabytes, and More... For computer hard drives and memory sizes.
Online Conversion - Filesize Download Speed Calculator
Enter a file size and estimate the download speed with various modems.
Online Conversion - HTML Color Picker
Pick a color and find out the HTML color code.
Online Conversion - Meta Tags
Quick and easy way to create the Meta Tags for your HTML pages.