Prefixloom: Subnet Planner

Plan CIDR Growth Offline

$0.99 · Designed for iPad. Not verified for macOS.

Plan IPv4 CIDR blocks, project growth, preserve reservations, compare utilization pressure, and document ownership without an enterprise IPAM. 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 - 110 original offline technical plates - 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.

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The developer, Robert Corbin, 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.

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    Accessibility

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    Information

    Seller
    • Robert Corbin
    Size
    • 72.5 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    4+
    Copyright
    • © 2026 Robert Corbin
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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