# SubnetCalc Pro — SubnetCalc Pro for the IT-Pros

> SubnetCalc Pro for the IT-Pros (iPhone/iPad app by Julian Christopher Siebert.)

- Source: https://appshunter.io/ios/app/subnetcalc-pro/id6754798969 (this page in markdown: same URL + `.md`)
- Developer: [Julian Christopher Siebert](https://appshunter.io/developer/1830495244)
- Category: Utilities, Developer Tools
- Price: $0.99 (on sale, was $1.99)
- Age rating: 4+
- Requires: iOS 18.6 · 1 MB
- Languages: English, German
- Released: 2025-11-04
- Data updated: 2026-06-11
- User reviews in markdown: https://appshunter.io/ios/app/subnetcalc-pro/id6754798969/reviews.md

## What is SubnetCalc Pro?

• SUBNET CALCULATOR (IPv4 & IPv6)
Calculate network addresses, broadcast, host ranges and more. Smart IP input field with automatic octet separation, number keyboard, and auto-jump. Binary view with color highlighting (network bits blue, host bits green).

• IP OWNER LOOKUP
Discover who owns an IP address. Shows organization, ISP, ASN, location on map (MapKit) and more. Auto-search after 1 second. Multi-API with fallback (IP-API.com, ipapi.co, ipinfo.io). 24h offline cache.

• VLSM CALCULATOR
Plan complex subnet structures. Automatic calculation of optimal CIDR values. IP shortage warning. Export as PDF or CSV. History of last 10 plans.

• SUBNET REFERENCE
Complete table of all subnet masks (/0 to /32). Search/filter function. Favorite stars for frequently used masks.

• NETWORK TOOLS
- HTTP Ping: Test connectivity with real response times
- Port Scanner: Scan common ports (SSH, HTTP, HTTPS, RDP, MySQL)
- DNS Lookup: Domain resolution via Google DNS
- IP Batch Scanner: Scan IP ranges, CSV export


## Version history (last 3 releases)

### 1.3 — 2026-04-27

New in 1.3 — full IPv6 support, a Home Screen widget, Siri Shortcuts, a Bonjour browser, and a Share Extension that turns any IP you find on the web into an instant subnet breakdown.

NEW
• IPv6 calculator — parse any form (::, embedded IPv4, zone IDs), see compressed & expanded notation, scope (link-local, ULA, multicast, global), and derive SLAAC/EUI-64 from a MAC.
• MAC OUI vendor lookup — offline database of ~250 common vendors (Apple, Cisco, AVM, Ubiquiti, Raspberry Pi…) with U/L and multicast flags.
• Reverse DNS (PTR) — resolve hostnames from IPv4 or IPv6 addresses.
• Bonjour / mDNS browser — discover printers, AirPlay, SSH, HomeKit and more on your local network.
• Siri Shortcuts — calculate subnets, look up IPs, or find MAC vendors with your voice.
• Home Screen widget — your current local and public IP at a glance.
• Share Extension — select any IP in Safari or Mail for an instant subnet breakdown.

FIXED
• Correct host counts for /31 (RFC 3021 point-to-point) and /32 single-host routes.
• VLSM handles exact-fit allocations without overflow and aligns to the network boundary.
• Hardened bit-shift math for /0 and /32 edge cases.

### 1.2 — 2026-03-15

*1.2*

Stability Improvements

### 1.0 — 2025-11-04

No release notes.

## More apps by Julian Christopher Siebert

- [OMW for Tesla](https://appshunter.io/ios/app/omw-for-tesla/id6755054453)
- [HomeFreeze for Homekit](https://appshunter.io/ios/app/homefreeze-for-homekit/id6759217068)
- [My little Pinneberg](https://appshunter.io/ios/app/my-little-pinneberg/id6759555314)
- [ZahlenBitte](https://appshunter.io/ios/app/zahlenbitte/id6760587443)
- [Ski Resort Finder](https://appshunter.io/ios/app/ski-resort-finder/id6760788575)

All apps by Julian Christopher Siebert: https://appshunter.io/developer/1830495244

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-11.*