域名通过“dig”存在
是否可以通过检查“dig”的输出来检查域名是否存在？ 在绑定源中，我发现了这些常量：
0 DNS_R_NOEROR
1 DNS_R_FORMERR
2 DNS_R_SERVFAIL
3 DNS_R_NXDOMAIN
4 DNS_R_NOTIMP
5 DNS_R_REFUSED
6 DNS_R_YXDOMAIN
7 DNS_R_YXRRSET
8 DNS_R_NXRRSET
9 DNS_R_NOTAUTH
10 DNS_R_NOTZONE
16 DNS_R_BADVERS
<RCODE 11> # 11 has no macro
<RCODE 12> # 12 has no macro
<RCODE 13> # 13 has no macro
<RCODE 14> # 14 has no macro
<RCODE 15> # 15 has no macro
在我看来，NOERROR & SERVFAIL 意味着主机名存在（尽管它并不意味着 IP 已链接到它）。 NXDOMAIN 意味着它绝对不存在。
我不喜欢使用 whois，因为它很慢。 dig 速度要快得多，因为我只需要确定主机名尚不存在。
有人可以阐明我的假设和其他宏吗？
谢谢
Would it be possible to check a domain name its existence by checking the output of "dig"?
Inside the bind sources I found these constants:
0 DNS_R_NOEROR
1 DNS_R_FORMERR
2 DNS_R_SERVFAIL
3 DNS_R_NXDOMAIN
4 DNS_R_NOTIMP
5 DNS_R_REFUSED
6 DNS_R_YXDOMAIN
7 DNS_R_YXRRSET
8 DNS_R_NXRRSET
9 DNS_R_NOTAUTH
10 DNS_R_NOTZONE
16 DNS_R_BADVERS
<RCODE 11> # 11 has no macro
<RCODE 12> # 12 has no macro
<RCODE 13> # 13 has no macro
<RCODE 14> # 14 has no macro
<RCODE 15> # 15 has no macro
In my opinion NOERROR & SERVFAIL means the hostname exists (although it doesn't mean an ip is linked to it). NXDOMAIN would mean it absolutely not exists.
I prefer not to use whois because it is quite slow. dig is much faster as I just need to be certain that the hostname doesn't exist yet.
Could someone shine their light on my assumptions and the other macros?
Thanks
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好吧，在某些情况下它可能会起作用，但在大多数情况下，您会看到不正确的结果 - 某些域已注册，但在 TLD 名称服务器中没有记录。有些域名配置了记录，但未注册，因为某些注册管理机构配置了通配符域名：
whois 确实很慢 - 与您的域名提供商联系，大多数注册管理机构提供更快的方法来检查域名是否已注册（即 EPP 协议） ）
Well, in some cases it might work, but in most cases you will see incorrect results- some domains are registered but do not have a record in the TLD name server. And some domains have a record configured but are not registered as some registries have wildcard domains configured:
whois indeed is slow - speak to a/your domain provider, most registries offer faster methods to check if a domain is registered or not (i.e. EPP protocol)
不，你不能。至少，Dig 可以告诉您该域是否有名称服务器记录，但即使响应是否定的，也不意味着该域可用。
唯一的方法是执行 WHOIS 查询。
No, you can't. At least, Dig can tell you if the domain has a nameserver record, but even if the response is negative, it doesn't mean the domain is available.
The only way is to perform a WHOIS query.
只需询问域的 SOA 记录即可：
while
不返回任何内容
Just ask for the SOA records of the domain :
while
returns nothing