{"id":24,"date":"2026-09-11T06:13:45","date_gmt":"2026-09-11T06:13:45","guid":{"rendered":"https:\/\/www.tempohosting.co.uk\/blog\/dns-ttl-explained-choosing-the-right-value\/"},"modified":"2026-09-18T09:46:40","modified_gmt":"2026-09-18T09:46:40","slug":"dns-ttl-explained-choosing-the-right-value","status":"publish","type":"post","link":"https:\/\/www.tempohosting.co.uk\/blog\/dns-ttl-explained-choosing-the-right-value\/","title":{"rendered":"DNS TTL Explained: How to Choose the Right Value for Your Website"},"content":{"rendered":"

When you change a DNS record, the update does not necessarily reach every visitor at the same moment. One of the main reasons is DNS TTL, or Time to Live. TTL controls how long recursive DNS resolvers can keep a cached copy of a DNS record before asking the authoritative DNS server for fresh information.<\/p>\n

Choosing the right TTL can make website migrations smoother, reduce unnecessary DNS traffic and give you more control when infrastructure changes.<\/p>\n

What DNS TTL Actually Does<\/h2>\n

TTL is expressed in seconds and is configured for individual DNS records. A TTL of 3600 means a resolver may cache the record for up to one hour. During that time, repeated queries can be answered from cache instead of contacting the authoritative server again.<\/p>\n

Caching improves efficiency and reduces the number of DNS queries that travel across the internet. The trade-off is that cached information can remain visible for a while after you change a record.<\/p>\n

For a deeper technical overview, the ClouDNS guide to TTL<\/a> explains how different values affect cached DNS records.<\/p>\n

Short TTL Versus Long TTL<\/h2>\n

There is no single TTL that is perfect for every website.<\/p>\n

A shorter TTL, such as 300 seconds, is useful when you expect a record to change soon. It allows many resolvers to refresh their cached data relatively quickly. This can help during server migrations, failover testing or other planned infrastructure work.<\/p>\n

A longer TTL, such as several hours, reduces how often resolvers need to query authoritative DNS servers. It can be a good choice for stable records that rarely change.<\/p>\n

Very low TTL values should not automatically be used everywhere. They create more DNS queries and may provide little benefit for records that remain unchanged for months.<\/p>\n

Plan TTL Before a Website Migration<\/h2>\n

TTL matters most before a planned change.<\/p>\n

Imagine that your website currently points to one server and you plan to move it to a new hosting platform. If the existing A or AAAA record has a TTL of 24 hours, some resolvers may continue using the old address for many hours after the change.<\/p>\n

A better approach is to reduce the TTL in advance, wait for the previous longer TTL to expire, and then perform the migration. After the new server is working correctly, you can increase the TTL again.<\/p>\n

Lowering the TTL only after changing the server address does not immediately remove records already cached with the old value.<\/p>\n

Use Different TTL Values When Appropriate<\/h2>\n

Not every DNS record needs the same TTL. Records connected to dynamic services may benefit from shorter values, while stable records can use longer ones.<\/p>\n

For example, an A record used with automated failover may need faster refreshes than a TXT record used for verification. Treating TTL as a per-record setting rather than one value for the whole domain gives you more flexibility.<\/p>\n

A Practical Starting Point<\/h2>\n

For many ordinary websites, a TTL around one hour offers a sensible balance between caching efficiency and the ability to make changes without excessive delay. Before major migrations or infrastructure changes, lowering relevant records to five or ten minutes can provide additional flexibility.<\/p>\n

The goal is not to use the lowest possible TTL. Choose values based on how often a record changes, how quickly updates may need to take effect and how critical the service is.<\/p>\n

A small amount of TTL planning can make DNS changes more predictable and help prevent avoidable disruption during website maintenance.<\/p>\n","protected":false},"excerpt":{"rendered":"

Learn how DNS TTL affects caching, propagation, website migrations and reliability, and how to choose a practical TTL value for your DNS records.<\/p>\n","protected":false},"author":2,"featured_media":28,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[2],"tags":[10,12,11,9,13],"class_list":["post-24","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dns","tag-dns-caching","tag-dns-hosting","tag-dns-propagation","tag-dns-ttl","tag-website-migration"],"yoast_head":"\nDNS TTL Explained: How to Choose the Right Value for Your Website - Tempo Hosting Blog<\/title>\n<meta name=\"description\" content=\"Learn how DNS TTL affects caching, propagation, website migrations and reliability, and how to choose a practical TTL value for your DNS records.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.tempohosting.co.uk\/blog\/dns-ttl-explained-choosing-the-right-value\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DNS TTL Explained: How to Choose the Right Value for Your Website - 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