PerformanceResourceTiming.domainLookupEnd

The domainLookupEnd read-only property returns the timestamp immediately after the browser finishes the domain-name lookup for the resource.

If the user agent has the domain information in cache, domainLookupStart and domainLookupEnd represent the times when the user agent starts and ends the domain data retrieval from the cache.

Value

The domainLookupEnd property can have the following values:

  • A DOMHighResTimeStamp representing the time immediately after the browser finishes the domain name lookup for the resource.
  • 0 if the resource was instantaneously retrieved from a cache.
  • 0 if the resource is a cross-origin request and no Timing-Allow-Origin HTTP response header is used.

Examples

Measuring DNS lookup time

The domainLookupEnd and domainLookupStart properties can be used to measure how long it takes for the DNS lookup to happen.

const dns = entry.domainLookupEnd - entry.domainLookupStart;

Using a PerformanceObserver:

const observer = new PerformanceObserver((list) => {
  list.getEntries().forEach((entry) => {
    const dns = entry.domainLookupEnd - entry.domainLookupStart;
    if (dns > 0) {
      console.log(`${entry.name}: DNS lookup duration: ${dns}ms`);
    }
  });
});

observer.observe({ type: "resource", buffered: true });

Or using Performance.getEntriesByType(), which only shows resource performance entries present in the browser's performance timeline at the time you call this method:

const resources = performance.getEntriesByType("resource");
resources.forEach((entry) => {
  const dns = entry.domainLookupEnd - entry.domainLookupStart;
  if (dns > 0) {
    console.log(`${entry.name}: DNS lookup duration: ${dns}ms`);
  }
});

Cross-origin timing information

If the value of the domainLookupEnd property is 0, the resource might be a cross-origin request. To allow seeing cross-origin timing information, the Timing-Allow-Origin HTTP response header needs to be set.

For example, to allow https://developer.mozilla.org to see timing resources, the cross-origin resource should send:

Timing-Allow-Origin: https://developer.mozilla.org

Specifications

Specification
Resource Timing
# dom-performanceresourcetiming-domainlookupend

Browser compatibility

BCD tables only load in the browser

See also