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Hello,
If you have just updated your Registrar with Route53 Name servers this might take some time depend on the Name Server TTL that is configured on previous Name servers(Usually 24 to 48 Hours). If this is the case you can check DNS propagation on the tools like Propagation Checker to see if Name servers are updated to R53 Name servers and if your domain is getting resolved to lightsail IP address.
If the tool does not show any output, then probably there is some issue with configuration. You can goto Route53 Hosted zone that you have created, and click on Test record and view the response returned by Route53 for your domain. While testing you can leave resolve IP address as blank, or use google DNS server IP address such as 8.8.8.8 to view the response. This tells if the DNS hosted name are configured correctly.
You can check who is your registrar by doing whois query from command line or using Icann Lookup and see if the Name servers returned is same as the one that is in R53 hosted zone. If the name servers are different you need to goto your registrar and update the name servers.
Apart from above there are some command line tool that can be used to check DNS response :
dig <yourdomain.com>
#Return Ip address of Domain
dig <yourdomain.com> NS
#Return Current Name servers of the domain.
dig <yourdomain.com> @8.8.8.8
#Return Ip address of your domain resolved by Google's DNS server.
dig <yourdomain.com> +trace
#Resolve the query from the root nameservers downwards , helps to identify where the resolution is failing.
