Planning
VLSM Wizard
Paste a list of host counts (500, 100, 30, 10). The wizard picks the smallest mask that fits each
tier (including reserved addresses for your chosen provider) and splits the tree to match. A live preview
updates as you type. Click Apply to commit the plan in one step — use Undo if you want to roll
it back.
Supernet Calculator
Paste CIDRs (one per line). Returns the smallest CIDR that contains every input prefix, with a tag explaining the result: all inputs share a parent, the set wraps into a clean supernet, or the set cannot be summarized in fewer bits.
Analysis
Workspace diff
Side-by-side diff of two open workspaces. Marks additions, deletions, and per-field changes (label, notes, VLAN, AZ). Apply modifications rewrites the source workspace's labels to match the target in one step. JSON export carries the full patch.
Workspace comparison
A flat table of every CIDR across two workspaces. Each row is tagged: only in A, only in B, identical, or conflicting (same CIDR but different labels). Good for aligning plans across regions or environments.
VPC peering validator
Cross-checks every pair of open workspaces for CIDR overlaps. For each overlap, reports the type (exact match, A contains B, B contains A, partial) and a recommendation. JSON export carries the full matrix. The Radar drawer also surfaces these live — the modal is here for the full report with export.
Networking
BGP aggregator
Paste BGP routes (one CIDR per line; lines starting with # or // are skipped).
Folds adjacent same-mask siblings into the shortest covering supernet. Shows original count, aggregated
count, and the percent reduction. JSON export lists every supernet and the routes it covers.
Import
The top-level Import button (next to Tools / Export) handles every supported input format: NetCalc Pro JSON snapshots, all-workspaces bundles, Infoblox CSV, and NetBox YAML. The format is auto-detected from the pasted content or uploaded file. There's no separate Import/sync tool entry — one modal covers everything.
Utilities
Bulk label editor
Every leaf of the tree in one editable table. Label, notes, VLAN, and AZ inline. Available-space rows are disabled until you name them. Apply commits every edit in one step; Undo rolls them all back together.
Use it for wholesale changes across dozens of rows. For edits on one or two rows, the main subnet table is
now inline-editable — Tab through the cells and commit on Enter. The Command Palette (⌘K) also
exposes a "Focus new row" entry to jump to the pinned create-row at the bottom of the table.
What's not here
NetCalc Pro is strictly a subnet planner. Cost estimation, compliance auditing, security-group rule generation, DNS zone authoring, capacity forecasting, and anycast routing strategy all live in other tools — those disciplines each deserve a dedicated product. The Radar drawer still flags overlap / labelling / VLAN issues live as you edit, so the subnetting-adjacent checks are always running even though no separate "audit" tool exists in the menu.