DNS 查询
瞬间查出某个域名的 A、MX、TXT 和 NS 记录。
服务器请求
DNS 查询
A and AAAA records point at the web server address, MX at the mail servers, TXT usually carries SPF and DMARC anti-spam policies, and NS names the authoritative servers for the domain. The TTL says how many seconds a resolver may cache the answer — which is why a DNS change takes time to propagate.
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