通配符 DNS 记录
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通配符 DNS 记录使用星号（*）匹配所有没有显式记录的 [[subdomain|子域名]]，使所有未定义的子域名都解析到同一个 IP 地址或目标。
示例
A wildcard A record *.example.com pointing to 1.2.3.4 means anything.example.com, random.example.com all resolve to that IP.