Free online network tools & utilities

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• Tools
  • Free network tools
  • Reverse IP · use reverse IP lookup (rDNS, .arpa domain and PTR record) and DNS resolution to determine domain name by IP address.
  • IPv6 Literal · external · online tool to convert IPv6 address to corresponding literal address. Also IP / IPv6 Calculator shows longest and shortest IPv6 versions / variations. An IPv6 address is represented as eight groups of four hexadecimal digits, each group is separated by a colon.

  • Featured network tools
  • My IP · shows your computer IP address, that is seen by web servers and network. IP address is exposed to any network service (web, FTP, etc.). If behind router / firewall, then gateway address is shown.
  • Smart Whois · find out an owner / registrar of an IP address or IP address block using Smart Whois domain lookup service.

  Network tools category provides free access to essential online network monitoring, analyzing and possible problem detection tools. All network tools are free. They are simple, yet efficient. Enjoy!

• Utilities
  • Free online utilities
  • Subnet Calc · compute network subnet (dotted decimal or CIDR notation) mask for IP address or range, or vice versa. Determine number of hosts, broadcast address and host class.

  • Featured online utilities
  • Hash & CRC · compute a wide range of checksums / hashes / message digests for any given text or an uploaded file.

  Online utilities category provides free access to most common daily use utilities for administrators, webmasters and power users. All online utilities are free and simple, yet efficient. Enjoy!

• Misc
  • Free stuff
  • Request header · view and analyze browser (user agent) request header.
  • Encode · encode any given text or uploaded file using most common binary to ASCII encoding algorithms.
  • Decode · decode any given text or uploaded file using most common ASCII to binary decoding algorithms.
  • EXE headers · analyze portable executable files (.exe, .dll, .drv, .sys, .etc) online and view basic header information and images / icons embedded into file.

  • Featured stuff
  • Response header · view web server response headers. Learn, analyze and reduce HTTP header overhead, and as a result, increase actual payload size, to fit more data into smaller number of network packets.
  • SilverBench · online multicore CPU benchmarking service (uses only JavaScript) to benchmark computer (PC or mobile device) performance using a photon mapping rendering engine. Three benchmark options available—Performance, Extreme, and Stress test. The photon mapping is performed by CPU alone (no GPU is used). Stress test is useful for CPU burn-in, temperature and stability testing.

  Miscellaneous stuff category includes miscellaneous tools & utilities, benchmarking stuff and other stuff, too. Everything is available at no cost, is free and simple as possible. Use and enjoy!

• My IP
• Smart Whois
• Hash & CRC
• Response header
• SilverBench
• Subnet Calc