Subnet Plus: Subnet Calculator2.4 - App Store

Subnet Plus is a fast, beautiful subnet calculator for network engineers, sysadmins, and students - now completely rebuilt for iPhone and iPad.

Type any IPv4 or IPv6 address and instantly see the network address, broadcast, usable host range, subnet mask, wildcard mask, prefix length, total and usable hosts, IP class, and address type. A live prefix stepper lets you dial the mask up or down and watch every value update in real time.

NETWORK CALCULATIONS
. IPv4 and IPv6, auto-detected
. Binary view with network/host bits color-coded
. Visual address-space map

PRO TOOLS
. VLSM Designer - carve a network into right-sized subnets and save the plan
. CIDR to subnet mask to wildcard converter
. Subnet membership - is an address inside a network?
. Range to CIDR, and supernet / aggregate
. CIDR cheat sheet

NETWORK UTILITIES
. DNS Lookup - A, AAAA, MX, NS, TXT, CNAME, SOA, SRV, and reverse PTR - using your device's resolver or any IPv4/IPv6 DNS server you add
. Ping - round-trip time and packet loss
. Traceroute - see the path to any host
. Path Monitor (Pro) - a live, MTR-style traceroute with per-hop packet loss and latency
. Network Scanner (Pro) - find the active devices on your local network, their names, and open ports
. Email Auth - check a domain's SPF, DKIM, and DMARC records

SIRI, WIDGETS & APPLE INTELLIGENCE
. Explain this - turn any subnet calculation or Email Auth report into a plain-English explanation, generated on-device by Apple Intelligence
. Siri & Shortcuts - calculate a subnet, ping a host, check a port, or ask "What's my network?" by voice, and use the same actions in your own Shortcuts
. Live Activities - follow Path Monitor and Network Scanner from the Lock Screen and Dynamic Island
. Home Screen widget - pin any saved subnet, with a different subnet per widget

SAVE & SYNC
. Label and save subnets, VLSM plans, and lookups
. Everything syncs across your devices with iCloud
. Share and export your results

Available in 45 languages. Remove ads with a one-time in-app purchase.

Version History What's new in 2.4:

• Explain this — a new card under your subnet results and Email Auth reports turns the numbers into a plain-English explanation, generated on-device by Apple Intelligence. Nothing leaves your phone.
• Siri & Shortcuts — say "Calculate a subnet in SubnetPlus", "Ping a host with SubnetPlus", "Check a port with SubnetPlus" or "What's my network in SubnetPlus", and use the same actions in your own Shortcuts
• Live Activities (Pro) — Path Monitor and Network Scanner now show latency, packet loss and scan progress on the Lock Screen and in the Dynamic Island while you're in another app
• Configurable widget — the Pinned Subnet widget can show any saved subnet: hold it, tap Edit Widget and pick one. Add several for different networks
• Path Monitor now pauses when SubnetPlus goes to the background and picks up where it left off when you return 2.4 Sep 15 This update rebuilds SubnetPlus with the iOS 27 SDK for continued compatibility with the latest iOS release. No features have changed. 2.3.1 Sep 15 What's new in 2.3:

• Path Monitor (Pro) — a live, MTR-style traceroute that keeps probing every hop and shows per-hop packet loss and latency, so you can see exactly where a problem starts
• Network Scanner (Pro) — sweep your local network to find active devices, their names, and open ports
• Tool Guide — a plain-language guide to every tool, with a field note on each; tap any entry to open that tool
• App Language — a new setting keeps SubnetPlus in the language you prefer 2.3 Jul 20 What's new in 2.2:

Eight new tools, now organized into Calculators, Diagnostics, and Reference:

• My Network — your device's network at a glance: local IP and subnet, DNS servers, gateway, Wi-Fi name, and public IP
• Split Subnet — divide a network into equal-size subnets by target prefix or count
• Overlap Check — paste a list of CIDRs to find conflicts and the smallest summarizing set
• Port Scan — check which TCP ports are open on a host
• Config & Docs — export a subnet as a Markdown table, Cisco IOS config, or reverse-DNS (PTR) zone
• Base Converter — convert IP addresses between binary, hex, and integer
• Bandwidth & MTU — a transfer-time calculator plus an MTU/MSS helper
• Common Ports — a searchable reference of well-known ports and services

Also new:
• Step to the previous or next subnet right from the calculator
• A quick . : / key bar speeds up typing addresses
• SubnetPlus Pro — a one-time upgrade that removes ads and unlocks alternate app icons, custom accent colors, and PDF export
• More Pro tools: WHOIS (domain, IP & ASN), Reverse DNS (PTR), and MAC Vendor
• The Home Screen widget now fits all its details cleanly
• Deleting a saved item now asks for confirmation 2.2 Jul 4 What's new in this update:

• New Email Authentication tool — check any domain's SPF, DKIM, and DMARC records at a glance
• More reliable DNS Lookup — large record sets no longer get cut off (EDNS0 with automatic TCP fallback)
• Refreshed app icon

Plus the accessibility and readability improvements from our last update:
• Full VoiceOver and Voice Control support, Reduce Motion, and improved contrast
• New Text Size setting (System, Compact, Extra Compact) to fit more on screen
• IPv6 addresses now stay on a single line for easier reading
• Calculate: the prefix control now sits next to the address, leaving more room for results
• Traceroute now shows every responding router on each hop
• Fixed the keyboard covering fields in DNS Lookup, Ping, and Traceroute 2.1 Jun 27 Version 2.0 is a complete, ground-up rebuild of SubnetPlus:

• Redesigned, faster interface built for the latest iOS
• Full iPad support with a multi-column layout
• A complete networking toolbox: IPv4/IPv6 subnet calculator, DNS Lookup, Ping, Traceroute, VLSM Designer, mask converter, supernet/aggregate, and more
• Live results as you type, with one-tap copy
• Save subnets, plans, and lookups — synced across your devices via iCloud
• Now available in 45 languages

Thanks for using SubnetPlus! We'd love your feedback. 2.0 Jun 16 Bug Fixes 1.6 07/02/2016 Fixed issues regarding Subnet Mask Display on the iPad and iPad Pro.
It is much more Awesomer with all of the Bug Fixes! 1.5 11/25/2015 Updated for iOS 9.1 Fixed truncation issue with binary and hex display on some devices.
Happy Subnetting! 1.3 11/16/2015 Fixed bug in iPad views that would truncate the subnet mask and wildcard views. 1.2 01/30/2014 We have gone Universal. Your favorite subnet calculator now supports the iPad.

We also killed a few bugs 1.1 01/17/2014 1.0 10/30/2013