public String getDomainName() {
        return this.domainName;
    }
<p>
The name of the domain that you want to get availability for. The top-level domain (TLD), such as .com, must be a
TLD that Route 53 supports. For a list of supported TLDs, see <a
href="https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/registrar-tld-list.html">Domains that You Can
Register with Amazon Route 53</a> in the <i>Amazon Route 53 Developer Guide</i>.
</p>
<p>
The domain name can contain only the following characters:
</p>
<ul>
<li>
<p>
Letters a through z. Domain names are not case sensitive.
</p>
</li>
<li>
<p>
Numbers 0 through 9.
</p>
</li>
<li>
<p>
Hyphen (-). You can't specify a hyphen at the beginning or end of a label.
</p>
</li>
<li>
<p>
Period (.) to separate the labels in the name, such as the <code>.</code> in <code>example.com</code>.
</p>
</li>
</ul>
<p>
Internationalized domain names are not supported for some top-level domains. To determine whether the TLD that
you want to use supports internationalized domain names, see <a
href="https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/registrar-tld-list.html">Domains that You Can
Register with Amazon Route 53</a>. For more information, see <a
href="https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/DomainNameFormat.html#domain-name-format-idns"
>Formatting Internationalized Domain Names</a>.
</p>

@return The name of the domain that you want to get availability for. The top-level domain (TLD), such as .com,
        must be a TLD that Route 53 supports. For a list of supported TLDs, see <a
        href="https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/registrar-tld-list.html">Domains that You
        Can Register with Amazon Route 53</a> in the <i>Amazon Route 53 Developer Guide</i>.</p>
        <p>
        The domain name can contain only the following characters:
        </p>
        <ul>
        <li>
        <p>
        Letters a through z. Domain names are not case sensitive.
        </p>
        </li>
        <li>
        <p>
        Numbers 0 through 9.
        </p>
        </li>
        <li>
        <p>
        Hyphen (-). You can't specify a hyphen at the beginning or end of a label.
        </p>
        </li>
        <li>
        <p>
        Period (.) to separate the labels in the name, such as the <code>.</code> in <code>example.com</code>.
        </p>
        </li>
        </ul>
        <p>
        Internationalized domain names are not supported for some top-level domains. To determine whether the TLD
        that you want to use supports internationalized domain names, see <a
        href="https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/registrar-tld-list.html">Domains that You
        Can Register with Amazon Route 53</a>. For more information, see <a href=
        "https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/DomainNameFormat.html#domain-name-format-idns"
        >Formatting Internationalized Domain Names</a>.
aws-java-sdk-route53/src/main/java/com/amazonaws/services/route53domains/model/CheckDomainAvailabilityRequest.java