使用 DNS 记录检查域名可用性 [英] Checking domain name availability with DNS records

问题描述

通过检查NS 或SOA(授权开始) 记录的存在，如何准确确定域名的可用性?

How accurately can a domain name's availibility be determined by checking for the existence of NS or SOA (Start of Authority) records?

如果不是，如何我如何准确确定这一点，而无需求助于 WHOIS?例如，如果不存在 NS 记录，是否值得检查 MX 记录?

If not, how can I determine this as accurately as possible without resorting to WHOIS? For example, is it worth checking for MX records if no NS records exist?

我对 .co.za 域特别感兴趣，但在 .co.za 命名空间中检查可用性的唯一官方、万无一失的方法是使用 http://co.za/whois.shtml，限制IP地址连续检查.

I am specifically interested in .co.za domains, but the only official, fool-proof way to check availability in the .co.za namespace is to use http://co.za/whois.shtml, which limits consecutive checking by IP address.

推荐答案

• Whois 是唯一 100% 确定的方式检查 .co.za 域可用性.看http://co.za/whois.shtml
• 我的测试表明，检查 NS 的存在批量记录或任何 DNS 记录似乎是最准确的方法猜测 .co.za 域是否可供注册.SOA 记录也有效，但效果不佳.
• dig co.za.NS 显示 .co.za TLD名称服务器.Ping TLD 服务器并使用最近的避免不必要的递归查询.
• Whois is the only 100% sure way of checking for .co.za domain availability. See http://co.za/whois.shtml
• My tests show that checking for the existence of NS records or ANY DNS records in bulk seems to be the most accurate way of guessing whether a .co.za domain is available for registration. SOA records work too, but not as well.
• dig co.za. NS shows .co.za TLD nameservers. Ping TLD servers and use the closest ones to avoid unncessary recursive queries.

感谢您的回答.

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