Slash - Subnet Calculator

iOS Universel / Utilitaires

Slash is a subnet calculator built for speed by someone who uses one every day.

Type or paste 192.168.1.0/24 and Slash returns the network address, usable host range, broadcast, mask, wildcard, and host count — before your finger lifts. Netmasks like 255.255.255.0, IPv6 prefixes like 2001:db8::/48, and hex masks like 0xffffff00 all work the same way.

DESIGNED FOR THE WAY YOU ACTUALLY WORK
• Cisco-style paste: copy "192.168.1.1 255.255.255.0" from a config or terminal and Slash auto-splits it into address + mask.
• Tap or click any result to copy. The value is on your clipboard before the haptic finishes.
• Recents are right where you need them. Tap to revisit, one tap to clear.
• Binary view: expand any /N to see the bit-by-bit breakdown of network and mask, with network bits highlighted.
• Smart input: the on-screen keyboard, prefix chips, example prompts, and parse hints all adapt to whichever family you're typing.

IPv4 AND IPv6, ONE APP
Toggle IPv6 in Settings — the keyboard, examples, and recents flip with it. No awkward two-mode UX. /31 honors RFC 3021 (no broadcast row); /32, hostnames, and partial IPv6 inputs are handled gracefully with helpful parse hints.

NATIVE EVERYWHERE
One Universal Purchase covers iPhone, iPad, and Mac. Each runs a real native build — no web wrappers, no cross-platform shims:
• iPhone: a custom keyboard accessory with the brand /, prefix chips, Mask, and ::.
• iPad: hardware-keyboard friendly with full paste support.
• Mac: ⌘, opens Settings; ⌃⌘T floats the window above every other app — keep the calculator visible while you read configs, browse packet captures, or jump between terminals.

History is kept locally on each device. (No iCloud sync in 1.0 — planned for a later release.)

THINGS SLASH WILL NEVER DO
• No accounts, no sign-in, no telemetry.
• No network calls — fully offline. Verify with Airplane Mode or Little Snitch.
• No third-party SDKs, ads, or trackers. Not now, not ever.

WHO MADE IT
I'm an active CCNA and working network engineer. I built Slash because every other subnet calculator on the App Store either looks like a 2010 form, makes a network call to compute something that should run in 50 microseconds, or both. The wedge here is design, speed, and Apple-native polish — not feature count.

WHO IT'S FOR
Network engineers, sysadmins, and IT pros who reach for a subnet calc dozens of times a day. Students learning how networks work — Slash's binary view is intentionally a teaching tool for wrapping your head around how a /26 actually divides up the host portion.

Privacy: Slash collects no data. Details at https://tylerdix.github.io/slash-site/#privacy

For questions or feedback, see the Support URL on this page.