SubnetCalc Pro
SubnetCalc Pro for the IT-Pros
Only for iPhone
$1.99 · Designed for iPhone. Not verified for macOS.
iPhone
Calculate network addresses fast
• 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
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
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.
The developer, Julian Christopher Siebert, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Julian Christopher Siebert
- Size
- 1.3 MB
- Category
- Utilities
- Compatibility
Requires iOS 18.6 or later.
- iPhone
Requires iOS 18.6 or later. - Mac
Requires macOS 15.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.6 or later.
- iPhone
- Languages
- English and German
- Age Rating
4+
- 4+
- Copyright
- © Christopher Siebert

