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Subnet statistics
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Subnets
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Planning
Analysis
Networking
Capacity & cost
Import / sync
Utilities
| Subnet · Label · Notes | IP Range | Usable Range | Network | Broadcast | Netmask | Usable Hosts | Actions |
|---|
Set a network + mask to begin.
Fragmentation
0/64Edit subnet
Name, notes, VLAN and availability zone for the selected subnet.
Import
Load a NetCalc snapshot, an all-workspaces bundle, or an IPAM feed.
Infrastructure as Code
Generate Terraform, CloudFormation, Pulumi, or Ansible from the current subnet plan.
terraform · aws · 0 subnets
VLSM Wizard
Auto-split the current network into tiers sized for the host counts you provide.
Preview appears as you type.
Supernet calculator
Find the smallest CIDR block that contains every input prefix.
Results appear here after computing.
Supernet
Merge sibling subnets
Collapse pairs of adjacent leaves back into their parent.
Scanning…
Mergeable pair
Subnet diff
Compare two workspaces side-by-side. Apply target field changes back to source with one click.
Additions
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Deletions
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Modifications
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Select two workspaces and click Generate diff.
Subnet comparison
Flat side-by-side comparison of two workspaces by CIDR.
Only A
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Identical
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Conflict
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Only B
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Pick two workspaces and click Run comparison.
BGP route aggregation
Fold adjacent same-mask CIDRs into the shortest covering supernet.
Parse errors
Original
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Aggregated
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Reduction
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Paste BGP routes and click Calculate to aggregate them.
DNS reverse zone generator
Emit one BIND-style reverse zone file per leaf subnet.
Pick a domain + nameserver and click Generate zones.
VPC peering validator
Check every workspace pair for CIDR overlaps that would block peering.
At least 2 workspaces are required. Click Validate to run.
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Security group templates
Emit per-subnet AWS / Azure / GCP firewall rules based on subnet labels.
Labels that include web,
app,
database,
cache,
management, or
private match a template.
0 groups
Cloud cost estimator
Rough monthly estimate for the active workspace: compute + NAT + egress.
Pick a cloud, region, and instance type, then click Calculate.
Capacity planner
Can the current workspace absorb N more hosts? Where should they go?
Set a host count and click Analyze.
Anycast planner
Assign an anycast range across selected workspaces — identical or segmented.
Pick a CIDR, strategy, and 2+ workspaces.
Terraform state import
Upload a terraform.tfstate JSON and import its subnet resources into a new workspace.
Pick a state file and click Parse.
IPAM sync
Round-trip subnets with Infoblox CSV or NetBox YAML. No live API — copy/paste.
Import (paste)
Export (from current workspace)
Compliance audit
Seven rules: labelling, VLAN uniqueness, management-plane isolation, overlap, and more.
Click Run audit to evaluate the current workspace.
Bulk label editor
Edit label, notes, VLAN, and AZ across every subnet at once.
| CIDR | Label | Notes | VLAN | AZ |
|---|
VLAN scanner
Scan every workspace for duplicate VLAN IDs on labelled subnets.
Click Scan to check for VLAN conflicts.
IPv4 CIDR cheat sheet
Every prefix length: netmask, total IPs, usable hosts (provider-adjusted).
| Mask | Netmask | Total | Usable |
|---|
Address space calculator
Given a list of required host counts, compute the smallest parent CIDR that fits every tier.
Enter host counts and click Calculate.
Keyboard shortcuts
Press ? anywhere to open this.
Global
- ? Open this shortcuts overlay
- Esc Close the topmost modal
- / Focus the IP search input
Editing
- Ctrl Z Undo last structural change
- Ctrl Y Redo
- Ctrl Shift Z Redo (alternate)
Subnet table
- Click Split Halve a subnet into two /n+1 children
- Click Join Collapse two siblings back into one parent
- Hover Join Highlight every row in the range that would be merged
Tips
- Share Copies a URL that encodes the full tree + labels
- Import Accepts the JSON / CSV / YAML / Terraform blob
- Tools menu Every pure engine (BGP / DNS / Security / …) lives here
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