Class DiscoveredService

Represents a discovered mDNS/DNS-SD service instance, as defined in the DNS-Based Service Discovery specification.

A DiscoveredService is constructed from multiple DNS resource records typically found in an mDNS response:

A PTR record that points to the instance's FQDN.
An SRV record that provides the target host and port.
A TXT record containing key-value metadata.
One or more A or AAAA records for IP addresses.
Optionally, additional subtype PTR records for selective discovery.

All records are typically retrieved from a single mDNS response.

See

Index

Properties

addresses binaryTxt? fqdn host lastSeen name port protocol? rawTxt? referer subtypes ttl ttlTimer? txt? type?

Properties

addresses

addresses: string[] = []

Resolved IPv4/IPv6 addresses of the service host.

Example

["192.168.1.42", "fe80::1c2a:3bff:fe4e:1234"]

See

https://datatracker.ietf.org/doc/html/rfc6762#section-5.4

`Optional`binaryTxt

binaryTxt?: Record<string, Buffer<ArrayBufferLike>>

Decoded binary TXT record key-value pairs.

Example

{ "note": <Buffer 04 6e 6f 74 65 0b 4f 66 69 63 65 20 50 72 69 6e 74 65 72> }

See

https://datatracker.ietf.org/doc/html/rfc6763#section-6

`Readonly`fqdn

fqdn: string

Fully qualified domain name (e.g., MyPrinter._ipp._tcp.local).

Example

"MyPrinter._ipp._tcp.local"

See

https://datatracker.ietf.org/doc/html/rfc6763#section-4.1.1

`Readonly`host

host: string

Hostname of the machine offering the service (SRV record target).

Example

"MyPrinter.local"

See

https://datatracker.ietf.org/doc/html/rfc2782

`Readonly`lastSeen

lastSeen: number

Last time the service was seen (in milliseconds since the Unix epoch).

Example

1634567890000

`Readonly`name

name: string

Short instance name of the service (first label of the FQDN).

Example

"MyPrinter"

See

https://datatracker.ietf.org/doc/html/rfc6763#section-4.1.1

`Readonly`port

port: number

TCP or UDP port on which the service is running.

Example

See

https://datatracker.ietf.org/doc/html/rfc2782

`Optional`protocol

protocol?: string

Network protocol used by the service (_tcp or _udp).

Example

"tcp"

See

https://datatracker.ietf.org/doc/html/rfc6763#section-4.1.2

`Optional`rawTxt

rawTxt?: string | Buffer<ArrayBufferLike> | (string | Buffer<ArrayBufferLike>)[]

Raw TXT record data as received over the network.

Example

<Buffer 04 6e 6f 74 65 0b 4f 66 66 69 63 65 20 50 72 69 6e 74 65 72>

See

https://datatracker.ietf.org/doc/html/rfc6763#section-6

`Readonly`referer

referer: RemoteInfo

Network info about where the service response came from.

Example

{ address: "192.168.1.101", family: "IPv4", port: 5353, size: 412 }

See

https://datatracker.ietf.org/doc/html/rfc6762#section-5

subtypes

subtypes: string[] = []

Subtypes advertised by the service for selective discovery.

Example

["scanner", "fax"]

See

https://datatracker.ietf.org/doc/html/rfc6763#section-7.1

`Readonly`ttl

ttl: undefined | number

Time-to-live value in seconds.

Example

See

https://datatracker.ietf.org/doc/html/rfc6762#section-10

`Optional`ttlTimer

ttlTimer?: Timeout

Timer for checking TTL expiration.

`Optional`txt

txt?: Record<string, string>

Decoded TXT record key-value pairs.

Example

{ "note": "Office printer", "paper": "A4" }

See

https://datatracker.ietf.org/doc/html/rfc6763#section-6

`Optional`type

type?: string

The registered service type (e.g., _http, _ipp).

Example

"ipp"

See

https://datatracker.ietf.org/doc/html/rfc6763#section-4.1.2

Class DiscoveredService

See

Index

Properties

Properties

addresses

Example

See

OptionalbinaryTxt

Example

See

Readonlyfqdn

Example

See

Readonlyhost

Example

See

ReadonlylastSeen

Example

Readonlyname

Example

See

Readonlyport

Example

See

Optionalprotocol

Example

See

OptionalrawTxt

Example

See

Readonlyreferer

Example

See

subtypes

Example

See

Readonlyttl

Example

See

OptionalttlTimer

Optionaltxt

Example

See

Optionaltype

Example

See

Settings

On This Page

`Optional`binaryTxt

`Readonly`fqdn

`Readonly`host

`Readonly`lastSeen

`Readonly`name

`Readonly`port

`Optional`protocol

`Optional`rawTxt

`Readonly`referer

`Readonly`ttl

`Optional`ttlTimer

`Optional`txt

`Optional`type