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HandyGrid collection

Network Engineer

Local networking utilities for subnetting, data rates, packet throughput, latency planning, and Base64 transformations.

Browse Network Engineer

IP Subnet CalculatorInspect an IPv4 CIDR network, mask, broadcast, range, and host count.Download, Upload and Backup Time CalculatorEstimate local file-transfer duration with size units, rate units, and an efficiency allowance.Data Transfer Rate ConverterConvert decimal network rates across bits and bytes per second.Packet Throughput CalculatorEstimate payload and wire throughput from packet rate, size, and overhead.Channel Capacity CalculatorEstimate gross data capacity from bandwidth and spectral efficiency.Bandwidth-Delay Product CalculatorRelate throughput and round-trip latency to the amount of data in flight.Video Storage CalculatorEstimate storage from average encoded bitrate, duration, and video count.CCTV Storage CalculatorEstimate surveillance storage from camera count, bitrate, recording hours, retention, and allowance.RAID Capacity CalculatorCompare raw and usable capacity for common equal-drive RAID layouts.MTU and Payload CalculatorCalculate maximum transport payload and header efficiency from an MTU and header sizes.VLAN ID Calculator and ClassifierValidate and classify an IEEE 802.1Q VLAN identifier locally.IPv6 Subnet Size CalculatorCalculate child-subnet count and address capacity from IPv6 prefix lengths.Wi-Fi Throughput EstimatorEstimate usable Wi-Fi throughput and an equal-share device rate from PHY speed and efficiency.TCP Window CalculatorEstimate the data-in-flight window needed for a throughput and round-trip latency target.Home Network Bandwidth PlannerPlan internet capacity from simultaneous streams, calls, other traffic, and headroom.Internet Connection Comparison CalculatorCompare transfer duration and latency for two fibre, cable, DSL, wireless, or other connections.Cloud Backup Duration CalculatorEstimate initial cloud-backup time and whether daily changed data fits a backup window.Storage Growth CalculatorProject storage capacity from current data, monthly growth, retained copies, and headroom.PoE Power Budget CalculatorCheck whether a switch power budget covers connected PoE devices and an allowance.Base64 Encode / DecodeEncode UTF-8 text to Base64 or decode it locally.

Start here: practical tutorial

Plan addressing and capacity before touching a live network

Enter the address, prefix, size, rate or drive count in the shown unit. Inspect boundaries and assumptions, then validate the proposal against vendor documentation.

  1. Choose the tool matching the input you have and the result you need.
  2. Confirm every unit, option and assumption before running it.
  3. Review the example, limitations and output before using the result.

Worked example

For 192.168.1.42/24 the subnet tool derives address boundaries, but cannot prove that a host is reachable.

What this does not replace

The utilities do not scan networks, configure equipment or cover every protocol and vendor convention.

Calculate an IPv4 subnet