AXFR / IXFR（区域传输）
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AXFR（权威区域传输，RFC 5936）是将[[zone-file|DNS区域]]的完整副本从主[[nameserver|名称服务器]]传输到辅助名称服务器的协议。IXFR（增量区域传输，RFC 1995）仅传输自上次同步以来的变更，从而减少带宽消耗。区域传输必须通过[[tsig|TSIG]]或IP白名单加以保护，因为开放的AXFR会将完整的DNS记录目录暴露给任何请求者，这是一种常见的信息泄露漏洞。
示例
Running `dig AXFR example.com @ns1.example.com` requests a full zone transfer — if the server is misconfigured, it returns every DNS record in the zone, exposing infrastructure details.