PacketPanda

Network Engineer Toolbox

Networking calculators built for real network work.

Calculate subnets, plan VLSM, convert CIDR ranges, build wildcard masks, and estimate transfers—fast, free, and in your browser.

Open IPv4 calculatorOpen VLSM planner
Private by default. Calculations run locally in your browser. The site does not send or save calculator inputs.
IPv4 subnetLive result pattern
Local
Address / CIDR192.168.50.14/27
Network
192.168.50.0/27
Broadcast
192.168.50.31
Usable range
192.168.50.1–30
Subnet mask
255.255.255.224
Wildcard
0.0.0.31
Usable hosts
30
27 network bits5 host bits

Version 1 toolbox

Five focused tools. One shared foundation.

All five launch tools are available now, from IPv4 address planning and conversion to wildcard matching and transfer-time estimation.

01Address analysisAvailable now

IPv4 Subnet Calculator

Network, broadcast, masks, hosts, binary, and address context from one input.

Designed as the reference workflow for every calculator that follows.
02Address planningAvailable now

VLSM Planner

Plan right-sized networks while respecting existing and reserved CIDR blocks.

A constraint-aware planner for brownfield as well as greenfield networks.
03Range conversionAvailable now

CIDR / Range Converter

Convert a CIDR to its exact range or a range to the minimal valid CIDR set.

Useful for firewall policy, cloud allowlists, routing, and documentation.
04Cisco workflowsAvailable now

Wildcard Mask Calculator

Convert subnet notation and analyze contiguous or arbitrary wildcard match patterns.

Canonical pairs, candidate checks, and clearly incomplete Cisco IOS-style templates.
05Time estimationAvailable now

Network Transfer Calculator

Estimate theoretical and realistic transfer time without mixing bits and bytes.

Compares the exact minimum with explicit efficiency or measured goodput.

Flagship workflow

Plan the network you have—not an empty textbook block.

The VLSM planner places new requirements around existing and reserved CIDRs, then exposes allocation, fragmentation, capacity, and free space in one auditable plan.

Open the VLSM planner
ExistingNewReservedFree
HQ/23Office/24FreeWAN/27Free
Parent 10.10.0.0/16Allocation status Fits

Auditable answers

Useful output includes its assumptions.

The product standard is a result an engineer can inspect, explain, and move into the next task.

01

Normalized

Keep the entered address and the calculated network distinct.

02

Contextual

Explain special cases instead of hiding them behind one number.

03

Copy-ready

Produce consistent summaries and documentation formats.

04

Standards-aware

Connect unusual behavior to the relevant technical standard.

Quick reference

Need the answer before the calculator?

The subnet cheat sheet will keep common masks, wildcards, address counts, and contextual host semantics in one compact reference.

Open subnet cheat sheet