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Network Calc: IPv4 Subnet & VLSM Calculator
x402
Network Calc: IPv4 Subnet & VLSM Calculator is a paid API for AI agents from network-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Splits an IPv4 network into equal subnets or allocates VLSM subnets from named host counts, returning ranges, netmasks, usable addresses, and leftover free blocks.
Price / call$0.02
Success—
StatusUnknown
How this service works
Split an IPv4 network into equal subnets, or allocate VLSM subnets from host counts (largest first) with ranges and leftovers.
Output
Returns an array of subnet allocations each with CIDR, prefix length, netmask, network address, broadcast address, first and last usable host, and name (for VLSM). Also returns a list of unallocated free blocks with their CIDRs and address counts, a mode indicator (equal-split or VLSM), a summary string, and fit status indicating whether all requested hosts fit within the parent network.
Example use cases
Office network IP address plan
“I need to design subnets for our new office network at 10.0.0.0/22 — we have four departments: Engineering needs 200 hosts, Sales needs 80, HR needs 30, and the WAN link needs 2. Can you do VLSM allocation and show me each subnet's CIDR, usable range, and what address space is left over?”
Equal subnet split for VLANs
“Split 172.16.0.0/20 into 16 equal subnets for me and list each one with its network address, broadcast, and usable host range.”
Point-to-point WAN link subnetting
“I'm allocating subnets from 10.10.0.0/24 for three router-to-router WAN links that each need 2 hosts — can you use /31s for those links (RFC 3021) plus one LAN segment needing 50 hosts, and tell me what's left over?”
Technical details
Endpoint
GEThttps://network-calc.x402tookit.com/subnet-vlsm?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically plan IPv4 address space — either carving a block into equal-sized chunks for VLANs/segments, or performing VLSM allocation where segments have different host requirements. It is purpose-built for network engineers and automation scripts that need precise subnet math including usable ranges, broadcast addresses, and leftover free block accounting. Prefer it over generic IP libraries when you want a structured JSON result with named allocations and free-block inventory in a single call.
Side effects
- Invalid or malformed CIDR (e.g. host bits set) returns an error with reasons array
- Requested parts not a power of two returns validation error
- Host counts exceed available space in the parent network — fits=false with explanation
- Conflicting parameters (both parts and hosts specified) may return an error
- Network parameter missing returns 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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