CLOSED BETA — LAUNCHING SOON

Sophisticated Subnetting
Engineered for Precision

iSubnet is a minimalist, fast, and feature-rich subnet calculator designed for network administrators, systems engineers, and students. Calculate CIDR boundaries, split subnets using VLSM, and convert prefixes on the go.

COMING SOON 🤖 Google Play COMING SOON 🍏 App Store ⚡ Try Live Demo
iSubnet PRO
IPv4 Subnet Calculation
192.168.1.0 /24
Netmask: 255.255.255.0
Network: 192.168.1.0
First Host: 192.168.1.1
Last Host: 192.168.1.254
Broadcast: 192.168.1.255
Total Hosts: 254
VLSM Split Table
Subnet #1 (/26): 62 Hosts
Subnet #2 (/27): 30 Hosts
🎨 Bit-level color display
INTERACTIVE DEMO

Full Calculation Engine — Try It Live

All five tools from the app, running real calculations in your browser. No install needed.

App theme:
/24
CIDR Notation
Subnet Mask
Wildcard Mask
Network Address
Broadcast Address
Total Usable Hosts
Usable IP Range
Binary IP Address BIT LEVEL
Binary Subnet Mask BIT LEVEL
IP Class
IP Type
/64
Compressed Address (nibble coloring)
Expanded Address
Prefix CIDR
/64
Network Prefix
Range Start
Range End
Total Addresses
/24
/26
#Subnet IPNetmaskUsable RangeUsable Hosts

Number Base Converter

BIN
OCT
DEC
HEX
POWERFUL TOOLKIT

Designed for Modern Workflows

Everything you need to plan, segment, and troubleshoot networks of any scale — from a single home router to enterprise clouds.

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IPv4 Subnet Calculation

Input any IP address and CIDR prefix to instantly see netmask, wildcard, host range, and class. Highlights bit-level boundaries in real-time.

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IPv6 Suite & BigInt Precision

Perform exact calculations on the massive 128-bit IPv6 address space. Visualizes nibble boundaries and compresses address strings natively.

✂️

Subnet Splitter (FLSM & VLSM)

Split networks evenly with FLSM or design highly efficient, zero-waste layouts customized to specific host requirements using VLSM.

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Flexible Mask Converter

Translate standard subnet masks, wildcard masks, prefix lengths, and CIDR blocks back and forth without breaking standard patterns.

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History & Saved Notes

Keep track of past calculations with instant restore. Pin custom titles, document server purposes, and copy configurations directly.

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Built for Mobile Portability

Engineered using lightweight vanilla technologies to fit natively inside iOS & Android. Fast, reactive, and completely standalone.

REAL WORLD SCENARIOS

Engineered to Solve Network Problems

When you’re out in the datacenter, configuring routers, or studying for exams, you need answers immediately. iSubnet is tailored for NFs, Admins, and Techs.

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On-Site Diagnostics

Calculate routing boundaries and wildcard masks instantly without opening heavy web pages or dealing with bad cell coverage.

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Academic Study Companion

Perfect helper for CCNA, CompTIA Network+, and advanced university level routing courses. Visualizes binary bits to teach network logic.

Why Network Engineers Choose iSubnet

Zero Ads & Premium Copy Actions Included
128-bit BigInt IPv6 Compressions Included
Variable Length Subnet Masking (VLSM) Pro Feature
Bulk Calculator & Report Exporter Pro Feature
What’s Next From Banzai GR

More Tools Coming Soon

iSubnet is the first app in a suite of precision networking tools for engineers. Here’s what’s on the roadmap.

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iRoute

BGP & static route planner

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iACL

Access control list builder

📊

iVLAN

VLAN topology designer

Have an idea for a new app? Tell us below.