@Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof Endpoint)) {
            return false;
        }

        Endpoint that = (Endpoint) o;
        return Objects.equals(this.listenerName, that.listenerName) &&
            Objects.equals(this.securityProtocol, that.securityProtocol) &&
            Objects.equals(this.host, that.host) &&
            this.port == that.port;

    }
Returns the port to which the listener is bound.
clients/src/main/java/org/apache/kafka/common/Endpoint.java