arp-lookup
About
arp-lookup is a simple ARP utility to map an IP address to a MAC address and vice versa.
Vendor information has been removed from v2 in favor of @network-utils/vender-lookup
Please see the CHANGELOG.md for the full list of breaking changes
Installation
```bash $ npm install @network-utils/arp-lookup ```Usage
Example
```typescript import arp from '@network-utils/arp-lookup' // Or import {toMAC, toIP, ...} from '@network-utils/arp-lookup' // Retrieve the corresponding IP address for a given MAC address await arp.toIP('04-A1-51-1B-12-92') // Or '04:a1:51:1b:12:92' (any valid MAC format) // Result: "192.168.2.47" // Retrieve the corresponding MAC address for a given IP address await arp.toMAC('192.168.2.47') // Result: "04:a1:51:1b:12:92" 👈🏼 All MAC addresses are normalized to this format arp.isMAC('04-a1:51:1B-12-92') // true arp.isMAC('not:a:mac') // false arp.isIP('192.168.2.47') // true arp.isIP('not.an.ip') // false // Note: Unavailable on darwin based systems. await arp.isType('dynamic', '192.168.2.47') // true await arp.isType('dynamic', '04:a1:51:1b:12:92') // true await arp.isType('static', '192.168.2.255') // true await arp.isType('static', 'ff:ff:ff:ff:ff:ff') // true await arp.isType('undefined', '0.0.0.0') // true // Note:type property is always set to "unknown" on darwin systems
await arp.getTable()
// Result:
{ ip: '192.168.137.255', mac: 'ff:ff:ff:ff:ff:ff', type: 'static' },{ ip: '224.0.0.22', mac: '01:00:5e:00:00:16', type: 'static' },{ ip: '224.0.0.251', mac: '01:00:5e:00:00:fb', type: 'static' },{ ip: '224.0.0.252', mac: '01:00:5e:00:00:fc', type: 'static' },{ ip: '239.255.255.250', mac: '01:00:5e:7f:ff:fa', type: 'static' },{ ip: '192.168.2.1', mac: '04:a1:51:1b:12:92', type: 'dynamic' },{ ip: '192.168.2.3', mac: '1a:b1:61:2f:14:72', type: 'dynamic' },{ ip: '192.168.2.255', mac: 'ff:ff:ff:ff:ff:ff', type: 'static' },{ ip: '224.0.0.2', mac: '01:00:5e:00:00:02', type: 'static' },...type property is always set to "unknown" on Unix systems
await arp.fromPrefix('01:00:5e')
// Result:
{ ip: '224.0.0.22', mac: '01:00:5e:00:00:16', type: 'static' },{ ip: '224.0.0.251', mac: '01:00:5e:00:00:fb', type: 'static' },{ ip: '224.0.0.252', mac: '01:00:5e:00:00:fc', type: 'static' },{ ip: '239.255.255.250', mac: '01:00:5e:7f:ff:fa', type: 'static' },{ ip: '224.0.0.2', mac: '01:00:5e:00:00:02', type: 'static' },...getTable(): Promise<IArpTable>
Returns a promise containing the parsed output of $ arp -a with the addition of a vendor field.
Note that the type property is always set to "unknown" on Unix systems
---
toMAC(ip: string): Promise<string | null>
Returns a promise containing the MAC that relates to ip or null if a match couldn't be made.
Throws an "Invalid IP" error if ip is not a valid IP address
---
toIP(mac: string): Promise<string | null>
Returns a promise containing the IP that relates to mac or null if a match couldn't be made.
Throws an "Invalid MAC" error if mac is not a valid MAC address
---
fromPrefix(prefix: string): Promise<IArpTableRow[]>
Returns any devices on the network with the specified MAC prefix, or an empty array if none exist.
Throws an "Invalid Prefix" error if prefix is not a valid MAC address prefix
---
isType(type: 'static' | 'dynamic' | 'unknown' | 'undefined', address: string): Promise<boolean>
addresscan be any valid IP or MAC address
address is type.
Pass type = "undefined" to determine if a record for address exists or not.
This method is useless on Unix based systems because $ arp -a doesn't return the type for an address
Throws an "Invalid address" error if address is not a valid IP or MAC address
---
isMAC(mac: string): boolean
Checks if a MAC address is valid
---
isPrefix(prefix: string): boolean
Checks if a MAC address prefix is valid
---
isIP(ip: string): boolean
Checks if an IP address is valid
---
IArpTableRow
```typescript
IArpTableRow {
ip: string
mac: string
type: 'static' | 'dynamic' | 'unknown'
}
```
---
IArpTable
An array of IArpTableRow's.
```typescript
type IArpTable = IArpTableRow
```
---
