PrefixLedger
Not claimedPrefix Ledger is a field book for IPv4 host counts and subnet cuts
By Maidlin Macpherson · ProductivityWhy we expect it: A focused, well-explained subnetting companion with clear offline value for network students and engineers.
About
Prefix Ledger is a field book for IPv4 host counts and subnet cuts. On the reckon desk, enter an address or CIDR, drag the prefix, and usable hosts, dotted mask, wildcard, and first/last host update as you type. Pin the blocks you reuse. Open the bit split when you want neighboring networks and binary.
The mask atlas highlights the tightest row for the host count you need, with prefix, dotted mask, wildcard, and usable hosts on one table from /0 to /32. The segment ledger takes a base block, then host counts by use, cuts large-to-small on aligned boundaries, and shows what is left. The drill board walks prefix and mask cards one at a time and keeps hits and misses on this phone. Term cards explain CIDR, RFC 3021, and VLSM without sending you to a web page.
Everything you write stays on this iPhone. Planning Folio is a one-time unlock for the full atlas, uncapped ledger pages, and the rest of the drill pack, with restore.
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