NetSubnet Toolkit: VLSM/CIDR

Subnet, VLSM and CIDR tools for networking. Fast IPv4 and IPv6 calculator, accurate and fully offline.

NetSubnet Toolkit is an all-in-one networking app for subnetting, IP addressing and network design. Built for network engineers, CCNA/CCNP students and IT professionals who need fast and reliable results anytime, even without internet access.

Key Features

Subnet Calculator (IPv4)

* Calculate network, broadcast, first and last host

* CIDR support (/8 to /32)

* Wildcard mask and binary format

VLSM Calculator

* Automatic subnet allocation

* Optimized host distribution

* No overlaps

CIDR / Subnet Mask Converter

* Convert prefix, subnet mask and wildcard

* Instant results

IPv4 and IPv6 Tools

* IPv6 network calculations

* Address expansion and compression

* Advanced prefix handling

Subnet Planner

* Split networks into multiple subnets

* Ideal for network design and architecture

IP Range Generator

* Generate IP address lists

* Perfect for CCTV, VoIP and enterprise networks

VLAN Assistant

* Quick VLAN calculations

* Automatic gateway suggestions

Configuration Generator

* Ready-to-use network configuration snippets

* Cisco-style commands

* Export and share easily

Smart History

* Save recent calculations

* Copy results instantly

Why choose NetSubnet Toolkit

* Professional subnet calculator and networking toolkit

* Works 100% offline

* Clean, fast and intuitive UI

* Accurate results for real-world networking

Perfect for

* Network engineers

* CCNA and CCNP students

* IT technicians

* Network administrators

Design networks faster, avoid subnetting errors and take your networking tools anywhere.