How long does DNS propagation take?

DNS propagation time is primarily determined by the TTL (Time to Live) value of the previous DNS record. A TTL of 3600 means resolvers can cache the old record for up to one hour. To speed up a planned DNS change, reduce the TTL to 300 seconds at least 24–48 hours before making the change.

How do I check if my DNS changes have propagated worldwide?

Enter your domain into the DNS propagation checker and select the record type. The tool queries from 50+ nodes across Europe, North America, Asia, and other regions. Nodes are highlighted green when they return the new value and red when they still return the old cached value. The world map shows propagation progress at a glance.

Why do some locations still show the old DNS record after I made a change?

Resolvers around the world cache DNS records for the duration of the record's TTL. Until that cache expires, different users in different regions may receive different DNS responses. This is normal — the old value will be replaced automatically once the TTL period has passed on each individual resolver.

Does changing my A record affect my MX record propagation?

No. Each DNS record type propagates independently. Changing your A record has no effect on the propagation status of your MX, CNAME, or TXT records. Use the record type selector to test each record type individually when verifying a full DNS migration.

check-host.cc 的 DNS 传播检测

Name: Check-Host check-host.cc schema.titles.dns-propagation
Author: Check-Host

If set, nodes are highlighted green/red based on match.

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DNS 传播检测 check-host.cc

位置	解析值	TTL	状态
Albania, Tirana
Australia, Sydney
Bosnia and Herzegovina, Novi Travnik
Bulgaria, Sofia
Canada, Montreal
Switzerland, Bern
Chile, Santiago
China, Hohhot
Germany, Nuernberg
Germany, Frankfurt am Main
Germany, Frankfurt am Main
Germany, Limburg
Germany, Frankfurt am Main
Germany, Duesseldorf
Denmark, Glostrup Municipality
Spain, Bilbao
Finland, Helsinki
Finland, Helsinki
France, Gravelines
France, Paris
United Kingdom, London
Georgia, Tbilisi
Greece, Athens
Hong Kong, Hong Kong
Croatia, Zagreb
Hungary, Budapest
Indonesia, Jakarta
Israel, Petach Tikwa
Israel, Netanja
India, New Delhi
Iceland, Reykjavik (Miðborg)
Italy, Como
Kuwait, Kuwait City
Lithuania, Pilaite
Latvia, Riga
Moldova, Chisinau
Netherlands, Amsterdam
Netherlands, Amsterdam
Netherlands, Amsterdam
Netherlands, Amsterdam
Norway, Oslo
Poland, Warsaw
Romania, Bacău
Romania, Bucharest
Serbia, Belgrade
Russia, St Petersburg
Singapore, Singapore
Turkey, Istanbul
Taiwan, Taipei
United States, Miami
United States, Dallas
United States, Kansas City
United States, Dallas
South Africa, Johannesburg

什么是 DNS 传播？

DNS 传播是指 DNS 记录变更扩散至全球各地解析器所需的时间。当你更新 A 记录、切换域名服务器或修改 MX 记录后，变更不会立即在全球生效。各地解析器会在记录的 TTL（Time to Live）到期前持续缓存旧值，因此不同地区的用户可能在同一时间收到不同的 DNS 响应。

传播需要多长时间？

传播时间主要取决于原 DNS 记录的 TTL 值。TTL 为 3600，意味着解析器最多可将旧记录缓存一小时；TTL 为 86400（24 小时）则可能导致整整一天的传播延迟。如需加快传播，建议在执行 DNS 变更前 24 至 48 小时将 TTL 降低至 300 秒，确保切换后解析器能快速获取新值。

本工具显示什么

本工具从分布在欧洲、北美、亚洲及其他地区的 50+ 个真实解析节点查询 DNS。每个节点显示当前解析值和 TTL。若输入预期值（如新的 IP 地址），返回该值的节点以绿色标记，仍返回旧值的节点以红色标记。世界地图可直观呈现传播进度的地理分布。

常见 DNS 变更场景

最常见的使用场景包括：将网站迁移到新服务器（A 记录变更）、切换 DNS 服务商（NS 记录变更）、验证邮件配置（MX、TXT/SPF、DKIM），以及检查 CDN 记录更新（CNAME）。各类记录独立传播——A 记录的变更不影响 MX 记录的传播状态。请通过记录类型选择器逐项检测。