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Traditional Chinese devices (Taiwan, Hong Kong) now open in Traditional Chinese. Minor stability improvements.
Instant subnet, mask, broadcast & host range for any IPv4 + CIDR. 100% offline.
The subnet calculator network engineers actually keep on their phone. Type any IPv4 address, slide the CIDR — get the network, broadcast, mask, wildcard, host range, total/usable hosts, IP class, and binary breakdown instantly. No login. No internet. No tracking. WHY ENGINEERS PICK THIS ONE: 🔢 IPv4 + CIDR (0–32) Smooth slider lets you scan the entire prefix space. Network and host bits highlight live in the binary view. ⚡ Instant Subnet Results Network Address · Broadcast · Subnet Mask · Wildcard Mask · First Host · Last Host · Total Hosts · Usable Hosts. Tap any value to copy. 🟦 Binary Visualization Each octet shown as 8-bit binary with network bits highlighted in your accent color. Hex per octet too. Finally see what /27 actually looks like. 🏷 IP Class & Private Detection Class A/B/C/D/E auto-detected. RFC 1918 private ranges (10/8, 172.16/12, 192.168/16) flagged with a lock badge. 🎯 One-Tap Presets 192.168.1.0/24 · 10.0.0.0/8 · 172.16.0.0/12 · 127.0.0.1/32. Skip the typing for everyday subnets. 🌙 Material 3 Dark Theme Designed to stay out of your way on long lab sessions. Light theme included. 🌍 37 Languages English, Korean, Japanese, Spanish, Portuguese, French, German, Italian, Russian, Turkish, Polish, Dutch, Hindi, Indonesian, Vietnamese, Thai, Filipino, Arabic, Chinese (Simplified & Traditional). PERFECT FOR: • Network engineers and sysadmins • CCNA / Network+ / CCNP exam prep • DevOps and SRE on-call work • Computer Science students • Home lab and homelab tinkerers • Cloud / VPC subnet planning 100% offline. Pure bit math. No data leaves your device. Built for people who plan subnets in their head and only need the calculator to double-check.