Calculates IPv4/IPv6 subnet details from CIDR notation — network/broadcast, netm
Calculates IPv4/IPv6 subnet details from CIDR notation — network/broadcast, netmask, wildcard (Cisco ACL) mask, binary/hex masks, usable host range, RFC classification (private/loopback/multicast), supernet, and subnet-split counts. Pass comma-separated CIDRs to detect overlaps and classify each pair (subnet/supernet/partial overlap/disjoint); multi-CIDR responses return {subnets, overlaps}.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
935 msmedian answer time
$0.005listed price per call
$0.005price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://netintel.dev/subnet/calc
| Category | Everything else |
|---|---|
| Provider host | netintel.dev |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.005 | 935 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"cidr": "10.0.1.0/24"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"cidr": {
"description": "CIDR block, e.g. 10.0.1.0/24 or 2001:db8::/48 (IPv6). Comma-separate multiple CIDRs for overlap/containment analysis, e.g. 10.0.0.0/16,10.0.1.0/24",
"type": "string"
}
},
"required": [
"cidr"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"binary_mask": {
"type": "string"
},
"broadcast": {
"type": "string"
},
"cidr": {
"type": "string"
},
"first_usable": {
"type": "string"
},
"hex_mask": {
"type": "string"
},
"ip_version": {
"type": "number"
},
"is_private": {
"type": "boolean"
},
"last_usable": {
"type": "string"
},
"netmask": {
"type": "string"
},
"network": {
"type": "string"
},
"prefix_length": {
"type": "number"
},
"rfc_classification": {
"type": "string"
},
"subnets": {
"type": "array"
},
"supernet": {
"type": "string"
},
"total_hosts": {
"type": "number"
},
"usable_hosts": {
"type": "number"
},
"wildcard": {
"type": "string"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}