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nexus/wiki/concepts/Private-Hosted-Zone.md
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---
title: "Private Hosted Zone"
type: concept
tags:
- AWS
- DNS
- Networking
last_updated: 2026-04-28
---
## Definition
Private Hosted ZonePHZ私有托管区是 Amazon Route 53 的一项功能,允许在指定的 Amazon VPC 内部解析自定义私有域名(如 `int-sas.local``corp.internal`。与公有托管区不同PHZ 的DNS记录不对互联网开放仅在关联的 VPC 内可见。
## Aliases
- Private Hosted Zone
- PHZ
- AWS 私有托管区
## Key Characteristics
- **VPC 范围隔离**DNS 记录仅在关联的 VPC 内可解析,保证内部域名不暴露
- **跨账号关联**VPC 可与另一个 AWS 账户拥有的 PHZ 关联,但必须先完成"授权Authorization"再执行"关联Association"
- **Resolver 自动优先**:当查询匹配 PHZ 中的域名时Route 53 Resolver 直接返回 PHZ 记录,不再转发至转发规则
- **多 VPC 支持**:一个 PHZ 可关联多个 VPC支持跨区域但建议同区域以减少延迟
- **集中化 vs 分散化**:在 Landing Zone 架构中,推荐集中式 DNS 账号管理 PHZ而非在每个业务账号中分散创建
## Related Concepts
- [[Route-53-Resolver]] — PHZ 依赖 Resolver 进行解析
- [[Resolver-Rules]] — 未匹配 PHZ 的查询由 Resolver Rules 转发
- [[VPC-Association-Authorization]] — 跨账号 PHZ 关联流程
- [[AWS-Landing-Zone]] — 多账号环境下的 PHZ 管理策略
## Sources
- [[ctp-topic-19-configuring-dns-within-aws-lzs]]