The RTCIceCandidate interface's read-only port property contains the port number on the device at the address given by ip at which the candidate's peer can be reached.

As is the case with most of RTCIceCandidate's properties, the value of port is extracted from the candidate a-line string specified when creating the RTCIceCandidate. The a-line string is obtained either from the RTCIceCandidateInit property candidate or from a-line string passed into the constructor upon using new RTCIceCandidate().


var port = RTCIceCandidate.port;


A 16-bit number indicating the port number on the device at the address indicated by ip at which the candidate's peer can be reached.

port is initialized to null if it is not specified in the candidate, or if the candidate string can't be parsed propertly.

Note: If port is null, passing the candidate to addIceCandidate() will fail, throwing an OperationError exception. This applies only if the candidate implements port.

Usage notes

Consider this SDP attribute line (a-line) which describes an ICE candidate:

a=candidate:4234997325 1 udp 2043278322 44323 typ host

The port number is found in the sixth field, which is "44323". In this case, the value of port will be 44323.


This code snippet fetches the IP address and port number of the candidate, storing them into an object for future use.

var candidateLoc = {
  address: candidate.ip,
  port: candidate.port


Specification Status Comment
WebRTC 1.0: Real-time Communication Between Browsers
The definition of 'RTCIceCandidate.port' in that specification.
Candidate Recommendation Initial definition.

Browser compatibility

ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
portChrome Full support 74Edge Full support ≤18Firefox No support NoIE No support NoOpera No support NoSafari ? WebView Android Full support 74Chrome Android Full support 74Firefox Android No support NoOpera Android No support NoSafari iOS ? Samsung Internet Android Full support 11.0


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Compatibility unknown