# Networks.(constructor) · @imqueue/net

Source: https://imqueue.org/api/net/latest/net.networks._constructor_/
Published: 2026-08-01
Author: @imqueue maintainers (https://github.com/imqueue)
Package: @imqueue/net 3.0.2 — generated reference, not hand-written

Builds a set from CIDR records of either family, or from previously packed buffers.

**Signature:**

```typescript
constructor(networks: string[] | Buffer, networks6?: Buffer);
```

## Parameters


| Parameter | Type | Description |
| --- | --- | --- |
| networks | string\[\] \| Buffer | a mixed array of CIDR records, each with an explicit `/prefix`; or a packed IPv4 buffer, in which case IPv6 must come via `networks6` |
| networks6 | Buffer | _(Optional)_ a packed IPv6 buffer. Usable alongside either form of `networks`. |


## Exceptions

TypeError if `networks6` is given but is not a Buffer, if any CIDR record's address is invalid, or if a buffer is empty or not a whole number of records.

RangeError if a CIDR record has no `/prefix` — a bare address is rejected, so a single host is `10.0.0.1/32` or `2001:db8::1/128`.

## Remarks

The array form is the usual one, and it does the sorting for you: records are split by family, so the order you list them in does not matter. The buffer form is for restoring a set you packed earlier and reads `networks` as IPv4 only — an IPv6 buffer passed as the first argument would be misread, so it belongs in `networks6`.

An empty array yields a set with neither family populated, which answers `false` to everything rather than throwing.

## Example


```typescript
// From records, mixed families in any order
const a = new Networks(['2001:db8::/32', '10.0.0.0/8']);

// Restored from packed buffers
const b = new Networks(a.ipv4.networks, a.ipv6.networks);
```