DNS propagation checker
Check the DNS propagation for any website using this online tool. This checker supports A, AAAA, NS, MX and TXT records.
It helps you debug DNS resolution issues, and to find the time it will take before your DNS records will propagate. It will also show you a warning when your DNS records are misconfigured.
How to check DNS records?
Not sure how to check DNS records? There are multiple ways, and we'll go through all of them:
- From the command line on Linux or Mac;
- From the command line on Windows;
- Using an online DNS checker.
If you're already familiar with using the command line, you can use a DNS checker that's built into your operating system. Both the
nslookup DNS checkers help you to quickly find the DNS records for a hostname.
dig comes pre-installed on Linux and MacOS. To check DNS records for a particular website, open a terminal and type
dig google.com, then hit enter. This will show the A records of the domain name google.com. To check a different record type, simply append it to the command like so:
dig google.com MX.
You can also use dig on Windows, but you'll have to install it first. It's more convenient to use the built-in nslookup command if you're using Windows. Open a terminal (Start → cmd.exe) and type
nslookup facebook.com to find the IP addresses that host Facebook.com. If you want to check for different record types than A records, you can add the
type argument. So,
nslookup -type=TXT facebook.com retrieves all TXT records of Facebook.com.
If you want to check the propagation of the DNS records at servers around the globe, then you'll have to execute this command for each server. This is where the online DNS checker comes in handy.
A more convenient way to find DNS records is to use an online DNS checker like the one on this page. It helps you check DNS records right from your browser, without the need for a command line. Simply scroll up, type the name of the website you want to check the DNS records of, and click "check propagation".
DNS domain tester
The Domain Name System (DNS) contains every domain name. It's sometimes useful to test a DNS domain to see what the IP addresses it resolves to. You can check a DNS domain with the tool on this page.
Scroll to the DNS domain checker at the top of this page and type the domain name you want to test. Click "check propagation" to see all DNS records for that domain.
Why check DNS propagation?
Whether you're setting up a new website, updating records for an existing site, or checking the configuration of a mail server, a DNS propagation checker can come in handy!
When setting up a new website, one of the things you'll have to do is configure DNS records. Nearly all hosting providers have dedicated DNS servers. You can use these to configure DNS records. If you want to use DNS servers of another organization, you'll have to point the NS records from the hosting provider there. This process can take a while, so it can be convenient to check if the DNS records are still propagating, or have already fully propagated.
Check updated records
If you're changing DNS records, there might be some DNS servers that cache the old version of your records. They will eventually remove that version, but it might take a while before the so-called 'time to live' (TTL) expires. So, if you've just updated your DNS records, you can use a DNS checker to find out whether the DNS servers are serving a fresh or stale set of records.
Mail server configuration
Email works like a distributed system, consisting of independent mail servers. The mail servers from Gmail and Outlook.com, for example, can change independently. They need some way to communicate these changes. That's where DNS comes in.
Everyone that has configured email for a domain name, has to update their DNS records. MX records tell which to which servers an email for a certain domain should be sent. TXT records contain SPF data that prevents spam. You can inspect these settings with a DNS checker.
How does it work?
You can check the DNS propagation of a domain name like this:
- Fill in a domain name in on the top of this page and click "check propagation".
- One of the servers of Nslookup will query the DNS records for that website using many local and global DNS servers.
- The DNS servers responds with DNS records.
- The DNS records are parsed and grouped, so you can easily see which servers respond with the same set of DNS records.