# Prefixloom: Subnet Planner — Plan CIDR Growth Offline

> Plan CIDR Growth Offline (iPhone/iPad app by Robert Corbin.)

- Source: https://appshunter.io/ios/app/prefixloom-subnet-planner/id6792495250 (this page in markdown: same URL + `.md`)
- Developer: [Robert Corbin](https://appshunter.io/developer/1890247992)
- Category: Utilities, Developer Tools
- Price: $2.99
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: English
- Released: 2026-07-29
- Data updated: 2026-09-08
- User reviews in markdown: https://appshunter.io/ios/app/prefixloom-subnet-planner/id6792495250/reviews.md

## What is Prefixloom?

Prefixloom is a focused local subnet planning desk for network engineers, homelab operators, consultants, students, and small teams still coordinating addresses in spreadsheets.

Compare assigned and reserved addresses with projected growth before a block becomes an operational constraint.

KEY FEATURES
- CIDR capacity and utilization model
- Projected-growth multiplier
- Reserved-address accounting
- Address pressure visualization
- VLAN and owner records
- Editable current and proposed intent
- CSV inventory import
- Offline planning packet
- Local PDF and JSON export
- No account, ads, analytics, tracking, IAP, or subscription

Prefixloom performs deterministic IPv4 capacity planning from recorded inputs; it does not discover live devices, reserve addresses, configure routers, or replace authoritative IPAM. Verify overlap, routing, DHCP, VRFs, security zones, cloud reservations, and current assignments before deployment.


## Version history (last 2 releases)

### 1.1 — 2026-08-31

Roughly 67 MB of image files were included in the download but never shown. They have been removed. Subnet maths is untouched.

### 1.0 — 2026-07-29

No release notes.

## More apps by Robert Corbin

- [Daily Word Journey](https://appshunter.io/ios/app/daily-word-journey/id6761548266)
- [Hush Secret Text](https://appshunter.io/ios/app/hush-secret-text/id6761658175)
- [Renew Guard](https://appshunter.io/ios/app/renew-guard/id6761755447)
- [Receipt to PDF](https://appshunter.io/ios/app/receipt-to-pdf/id6761782025)
- [Route Your Pay](https://appshunter.io/ios/app/route-your-pay/id6761783719)
- [Tip Arbiter](https://appshunter.io/ios/app/tip-arbiter/id6761786879)

All apps by Robert Corbin: https://appshunter.io/developer/1890247992

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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 2026-09-08.*