# IP Calc — CIDR, VLSM and cloud subnets > Mobile CIDR IPv4 calculator for network planning and subnetting. (iPhone/iPad app by Paul Taylor.) - Source: https://appshunter.io/ios/app/ip-calc/id290185565 (this page in markdown: same URL + `.md`) - Developer: [Paul Taylor](https://appshunter.io/developer/290185568) - Category: Reference, Utilities - Price: $4.99 - Rating: 5.00/5 from 1 App Store ratings · 15 written reviews indexed - Age rating: 4+ - Requires: iOS 17.0 · 4 MB - Languages: American English - Released: 2026-07-28 - Data updated: 2026-09-17 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/ip-calc/id290185565/reviews.md ## What is IP Calc? IP Calc is a subnet calculator for people who do this for a living. Type an address and the whole block appears as one figure you can read at a glance — network, usable range, broadcast, and how much space is actually in there. Drag the block to resize it and the numbers follow. THE COUNT YOUR CLOUD ACTUALLY GIVES YOU Textbook subnet math says a /20 has 4,094 usable addresses. Your VPC disagrees. Switch the reserve profile to AWS, Azure or GCP and the calculator, VLSM and Split all re-read under that provider's rules: five reserved addresses per subnet on AWS and Azure, four on GCP, and the smallest subnet each will accept — /28 on AWS, /29 on Azure and GCP. The app names the addresses it took instead of just subtracting them. Under AWS that reads network, VPC router, DNS, future use, broadcast — so you can see where the count went. START FROM WHAT YOU NEED You know you need room for 400 phones. Type the host count and IP Calc sizes the subnet for you: 400 hosts, /23, 510 usable. NINE TOOLS • VLSM Calculator — subnet a block by host count, with named allocations and the free space shown • Subnet Split — divide a block into equal subnets • Compare Subnets — overlap and containment, with the shared address count spelled out • Supernet Calculator — smallest covering block, and exactly how many addresses that wastes • IPv6 Subnet Calculator — prefix size and subnet count, /0 to /128 • Bandwidth Calculator — transfer time, rate and units • IP Converter — decimal, hex and binary • Wildcard / ACL Calculator — wildcard mask plus copy-ready Cisco ACL lines • IP Validator — check one address and name its type KEEP YOUR NETWORKS Bookmark the blocks you care about and give them names. Every pair of bookmarks is checked for collisions, and when two of them share addresses the app says so at the top of the screen and draws exactly where the overlap falls. Recents are kept separately and never trigger the check — a scroll trail is not a plan. HOW IT WORKS • Everything is calculated on your device. Nothing you type leaves it. • No account, no tracking, no network access at all. • No ads, no subscription. • Full VoiceOver support and Dynamic Type throughout. • A custom keypad on every field, matched to what that field accepts, so you are never hunting for a slash or a dot. ## Key features - Instant mobile CIDR IPv4 calculations - Displays network and broadcast addresses - Calculates subnet and wildcard masks - Shows host range (HostMin and HostMax) - Determines Max Subnets and Hosts/Net - Previous/Next Subnet navigation ## Chart rankings - #160 in Top Paid · Reference (US App Store) ## Recent user reviews (10 of 15) All indexed reviews: https://appshunter.io/ios/app/ip-calc/id290185565/reviews.md ### 5/5 — Best IP Calculator Out There *2026-08-21* IP Calc is my favorite IP calculator. The updated interface is clean, and the networking/subnet planning tools are a lifesaver for my workflow. Thanks to the developer for the thoughtful improvements-great work! ### 3/5 — Mask slider missing *2015-04-30* After updating to iOS 8.3, mask slider is missing. When you start the app, it's there for s second, then disappears. This is a great app, please fix. Thanks! ### 1/5 — CIDR not present *2015-04-21* Agreed. Following update to 8.3 CIDR is no longer visible. After entering an IP, I can no longer specify the bits to the mask. ### 2/5 — CIDR Mask slider bar no longer visible *2015-04-14* Up until the iOS 8.3 update, this was my IP calculator of choice. Basic calculator with CIDR slider provided 98% of my needs. Since 8.3, the slider bar is no longer visible, even though the functionality still exists. ### 5/5 — Great network calc *2010-04-23* Every network admin should have this app. ### 4/5 — Great App - Suggestion for Future *2009-11-15* This is a great app for the price. If you're a network administrator it's a must. I would like to see support for IPv6 and would love to have the ability to save info about my networks. Assigned ranges, descriptions, network settings (ie NAT, PAT, SNMP, Helper, DHCP, etc). Also would like to be able to track info about specific ip addresses on a network. ### 5/5 — То что нужно. *2009-10-29* Ничего лишнего. Все что необходимо на одном экране. Отлично. ### 5/5 — Simple, fast, and accurate *2009-10-17* This is a great simple to use subnet calculator. I'm not sure what the previous poster is referring to in regards to it's accuracy...a /30 does in fact give you 2 hosts, 1 network, and 1 broadcast address..so this app is accurate. Great app. ### 5/5 — nice app, one problem *2009-10-04* 31 subnet bits is supposed to be able to host 2 hosts, 30 is supposed to host 4 hosts. however, the app shows that 30 bits hosts 2, and 29 hosts 6. it's missing 4 hosts ### 5/5 — It is all you need *2009-09-09* Been a Network Architect for 20+ years. This ap does it all. Suppers CIDR. Supports full VLSM with IP Net mask, subnet mask, and host mask. So say you have a /25 net with a /27 subnet mask, it will show you that you have 8 subnets of size /27 in the single /25 of 30 host IPs each. Nice. ## Frequently asked questions about IP Calc ### What is IP Calc? IP Calc is a mobile application designed to help users quickly plan network changes by calculating subnet-related information instantly. ### What kind of calculations does IP Calc perform? IP Calc performs instant mobile CIDR IPv4 calculations, displaying network and broadcast addresses, subnet and wildcard masks, host ranges, and the maximum number of subnets and hosts per network. ### Can IP Calc help me find adjacent subnets? Yes, IP Calc features 'Previous Subnet' and 'Next Subnet' buttons, allowing you to quickly determine an entire range of network addresses. ### What devices does IP Calc support? IP Calc is supported on iPhone and iPod devices. ### Is IP Calc free to use? Based on the provided data, IP Calc is a paid application. ### Does IP Calc have ads? No, IP Calc does not contain advertisements. ### How often is IP Calc updated? IP Calc was last updated on July 28, 2026, with version 1.01, which includes state saving across restarts. ### What is the age rating for IP Calc? IP Calc has an age rating of +4. ## Version history (last 4 releases) ### 2.0.1 — 2026-09-02 Minor polish fixes, plus a refreshed App Store description. ### 2.0 — 2026-08-20 IP Calc has been rebuilt from the ground up. • The address space is now a figure you can drag to resize, not a table you have to decode • Reserve profiles for AWS, Azure and GCP, so the usable count matches what your VPC will actually give you • Size a subnet from a host count instead of guessing at a prefix • Nine tools: VLSM, subnet split, compare, supernet, IPv6, bandwidth, converter, wildcard/ACL and validator • Bookmarks with labels, and an automatic overlap check across all of them • Full VoiceOver support and Dynamic Type throughout • Still calculated entirely on your device, with no network access at all ### 1.01 — 2026-07-28 Now saves state across restarts. ### 1.0 — 2008-09-10 No release notes. ## Related topics [cidr calc](https://appshunter.io/ios/topics/cidr-calc) --- *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 2026-09-17.*