Use DescribeLoadBalancers with an AWS SDK or CLI

    /// <summary>
    /// Get the HTTP Endpoint of a load balancer by its name.
    /// </summary>
    /// <param name="loadBalancerName">The name of the load balancer.</param>
    /// <returns>The HTTP endpoint.</returns>
    public async Task<string> GetEndpointForLoadBalancerByName(string loadBalancerName)
    {
        if (_endpoint == null)
        {
            var endpointResponse =
                await _amazonElasticLoadBalancingV2.DescribeLoadBalancersAsync(
                    new DescribeLoadBalancersRequest()
                    {
                        Names = new List<string>() { loadBalancerName }
                    });
            _endpoint = endpointResponse.LoadBalancers[0].DNSName;
        }

        return _endpoint;
    }

To describe a load balancer

This example describes the specified load balancer.

Command:

aws elbv2 describe-load-balancers --load-balancer-arns arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/app/my-load-balancer/50dc6c495c0c9188

Output:

{
  "LoadBalancers": [
      {
          "Type": "application",
          "Scheme": "internet-facing",
          "IpAddressType": "ipv4",
          "VpcId": "vpc-3ac0fb5f",
          "AvailabilityZones": [
              {
                  "ZoneName": "us-west-2a",
                  "SubnetId": "subnet-8360a9e7"
              },
              {
                  "ZoneName": "us-west-2b",
                  "SubnetId": "subnet-b7d581c0"
              }
          ],
          "CreatedTime": "2016-03-25T21:26:12.920Z",
          "CanonicalHostedZoneId": "Z2P70J7EXAMPLE",
          "DNSName": "my-load-balancer-424835706.us-west-2.elb.amazonaws.com",
          "SecurityGroups": [
              "sg-5943793c"
          ],
          "LoadBalancerName": "my-load-balancer",
          "State": {
              "Code": "active"
          },
          "LoadBalancerArn": "arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/app/my-load-balancer/50dc6c495c0c9188"
      }
  ]
}

To describe all load balancers

This example describes all of your load balancers.

Command:

aws elbv2 describe-load-balancers

import {
  ElasticLoadBalancingV2Client,
  DescribeLoadBalancersCommand,
} from "@aws-sdk/client-elastic-load-balancing-v2";

export async function main() {
  const client = new ElasticLoadBalancingV2Client({});
  const { LoadBalancers } = await client.send(
    new DescribeLoadBalancersCommand({}),
  );
  const loadBalancersList = LoadBalancers.map(
    (lb) => `• ${lb.LoadBalancerName}: ${lb.DNSName}`,
  ).join("\n");
  console.log(
    "Hello, Elastic Load Balancing! Let's list some of your load balancers:\n",
    loadBalancersList,
  );
}

// Call function if run directly
import { fileURLToPath } from "node:url";
if (process.argv[1] === fileURLToPath(import.meta.url)) {
  main();
}

Example 1: This sample displays all the load balancers for the given region.

Get-ELB2LoadBalancer

Output:

AvailabilityZones     : {us-east-1c}
CanonicalHostedZoneId : Z26RNL4JYFTOTI
CreatedTime           : 6/22/18 11:21:50 AM
DNSName               : test-elb1234567890-238d34ad8d94bc2e.elb.us-east-1.amazonaws.com
IpAddressType         : ipv4
LoadBalancerArn       : arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/net/test-elb1234567890/238d34ad8d94bc2e
LoadBalancerName      : test-elb1234567890
Scheme                : internet-facing
SecurityGroups        : {}
State                 : Amazon.ElasticLoadBalancingV2.Model.LoadBalancerState
Type                  : network
VpcId                 : vpc-2cf00000

Example 1: This sample displays all the load balancers for the given region.

Get-ELB2LoadBalancer

Output:

AvailabilityZones     : {us-east-1c}
CanonicalHostedZoneId : Z26RNL4JYFTOTI
CreatedTime           : 6/22/18 11:21:50 AM
DNSName               : test-elb1234567890-238d34ad8d94bc2e.elb.us-east-1.amazonaws.com
IpAddressType         : ipv4
LoadBalancerArn       : arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/net/test-elb1234567890/238d34ad8d94bc2e
LoadBalancerName      : test-elb1234567890
Scheme                : internet-facing
SecurityGroups        : {}
State                 : Amazon.ElasticLoadBalancingV2.Model.LoadBalancerState
Type                  : network
VpcId                 : vpc-2cf00000

class ElasticLoadBalancerWrapper:
    """Encapsulates Elastic Load Balancing (ELB) actions."""

    def __init__(self, elb_client: boto3.client):
        """
        Initializes the LoadBalancer class with the necessary parameters.
        """
        self.elb_client = elb_client


    def get_endpoint(self, load_balancer_name) -> str:
        """
        Gets the HTTP endpoint of the load balancer.

        :return: The endpoint.
        """
        try:
            response = self.elb_client.describe_load_balancers(
                Names=[load_balancer_name]
            )
            return response["LoadBalancers"][0]["DNSName"]
        except ClientError as err:
            log.error(
                f"Couldn't get the endpoint for load balancer {load_balancer_name}"
            )
            error_code = err.response["Error"]["Code"]
            if error_code == "LoadBalancerNotFoundException":
                log.error(
                    "Verify load balancer name and ensure it exists in the AWS console."
                )
            log.error(f"Full error:\n\t{err}")