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[Home](./index.md) &gt; [bitburner](./bitburner.md) &gt; [NS](./bitburner.ns.md) &gt; [scan](./bitburner.ns.scan.md)

## NS.scan() method

Get the list of hostnames or IP addresses connected to a server.

**Signature:**

```typescript
scan(host?: string | null, returnOpts?: HostReturnOptions): string[];
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  host | string \| null | _(Optional)_ Optional. Hostname/IP of the server to scan, default to current server. |
|  returnOpts | [HostReturnOptions](./bitburner.hostreturnoptions.md) | _(Optional)_ Optional. Controls whether the function returns IPs. |

**Returns:**

string\[\]

Returns an array of hostnames.

## Remarks

RAM cost: 0.2 GB

Returns an array containing the hostnames or IP addresses of all servers that are one node way from the specified target server. The hostnames/IPs in the returned array are strings. Returns hostnames by default.

The server network is a tree graph with the home server at the root. The parent node is always the first item of the returned array.

For example, let's say the network looks like this:

```
home
--n00dles
--joesguns
----CSEC
------omega-net
```
ns.scan("home"): \["n00dles", "joesguns"\]: "home" is the root, so it does not have a parent node.

ns.scan("n00dles"): \["home"\]: "home" is the parent node of "n00dles".

ns.scan("joesguns"): \["home", "CSEC"\]: "home" is the parent node of "joesguns".

ns.scan("CSEC"): \["joesguns", "omega-net"\]: "joesguns" is the parent node of "CSEC".

ns.scan("omega-net"): \["CSEC"\]: "CSEC" is the parent node of "omega-net".

If you run the "scan-analyze" command at home, it won't show all servers due to its limited maximum depth. You can use this function with BFS (Breadth-first search) or DFS (Depth-first search) to traverse the network and discover all servers.

## Example


```js
// All servers that are one hop from the current server.
ns.tprint("Neighbors of current server.");
let neighbor = ns.scan();
for (let i = 0; i < neighbor.length; i++) {
    ns.tprint(neighbor[i]);
}
// All servers that are one hop from the current server, but by IP address.
ns.tprint("IPs of current server's neighbors.");
let neighbor = ns.scan(null, { returnByIP: true });
for (let i = 0; i < neighbor.length; i++) {
    ns.tprint(neighbor[i]);
}
// All neighbors of n00dles.
const target = "n00dles";
neighbor = ns.scan(target);
ns.tprintf("Neighbors of %s.", target);
for (let i = 0; i < neighbor.length; i++) {
    ns.tprint(neighbor[i]);
}
```

