IP Calc_e2
Every network,
one clean calculation.
IP Calc is a precision IPv4 & IPv6 subnet calculator for engineers who live in CIDR. A numeric-only keyboard, a guided subnet wizard, a split simulator, and route summarization — crafted into a tool you'll actually enjoy opening.
IPv4
Five tools. Zero friction.
Every calculation a network engineer reaches for in the field — bundled into a single, focused iPhone app.
IPv4 Calculator
Instant network, broadcast, first/last host, wildcard, host count, and address classification from any IP + CIDR.
IPv6 Calculator
Expanded & compressed forms, prefix math, scope detection, EUI-64 generation, and interface-ID breakdown.
Subnet Wizard
Answer a few questions and the app builds your subnet plan — no mental arithmetic, no scratch paper.
Subnet Division
Split any prefix into N equal subnets and see every network, range, and broadcast in a clean list.
Route Summarization
Paste multiple prefixes, get the minimal summary route. Great for ACLs, BGP, and redistribution.
History & Favorites
Every calculation is saved locally. Pin the ones you return to. Jump back to any result in one tap.
A calculator that types like a keypad, not a keyboard.
The address field opens a numeric-only keypad — digits and a dot. No switching input modes, no rogue letters. Just the keys you actually need.
- Network, broadcast, first/last usable host
- Subnet mask, wildcard mask, host counts
- Private / Public / Reserved classification
- Edit the IP without resetting your CIDR
IPv6, without the squinting.
Toggle between expanded and compressed forms, inspect prefix and interface ID, generate EUI-64 from a MAC address, and instantly see the address scope.
- Full expansion and :: compression
- Network prefix, first/last address
- Global, Link-Local, Unique Local, Multicast detection
- EUI-64 generation from a MAC address
Split a prefix. See every subnet at once.
Enter an original network and the number of subnets (or a target prefix) — get a full table of networks, broadcasts, and usable ranges in one view.
- Divide by count or by target prefix length
- Numeric-only input — no input-mode dance
- Tap any row for full subnet details
- Copy any field with one tap
Collapse many prefixes into one.
Paste a list of networks and get the smallest aggregate that covers them all. Perfect for writing tighter ACLs, cleaner BGP advertisements, and leaner route tables.
- Enter multiple IPv4 / IPv6 prefixes
- Instant minimal summary route
- Bit-level matching, no guesswork
- Copy the result straight into your config
Designed for people who ship networks.
Small details that make everyday subnetting faster and less error-prone.
Numeric keypad
Digits and dot only. No IME dance, no stray letters in an IP.
Sticky CIDR
Edit the IP without losing your prefix — calculations stay consistent.
Works offline
Pure math on device. No connection required.
Bilingual UI
Switch between English and 日本語 from the header, any time.
Copy anywhere
Every result is tap-to-copy — paste directly into your config.
History & favorites
Return to past calculations, pin the ones you use most.
Monospace results
Numbers line up so mistakes jump out before they ship.
iPhone-native
Crafted for iOS, not a ported web page. Feels right in your hand.
Anyone who reads a subnet mask in their sleep.
Your next subnet is already in your pocket.
IP Calc for iPhone — precision IPv4 / IPv6 math, built for the way you actually work.
View on the App Store
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