Hello @kiruba ,
Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.
I understand that you would like to know if there is a URL/dns name in Azure Application gateway by default to use other than Public ip address.
As mentioned in the below FAQ,
https://learn.microsoft.com/en-us/azure/application-gateway/application-gateway-faq#where-do-i-find-the-application-gateway-ip-and-dns
If you're using a public IP address as an endpoint, you'll find the IP and DNS information on the public IP address resource. Or find it in the portal, on the overview page for the application gateway. If you're using internal IP addresses, you can find the information on the overview page.
For the v2 SKU, open the public IP resource and select Configuration. The DNS name label (optional) field is available to configure the DNS name.
So, you can configure a DNS name label for your Application gateway using the below steps:
1) Go to the Application gateway resource in your Azure portal and click on the Frontend Public IP address:
2) Go to the Configuration tab of the Public IP resource and add a DNS name label for this Public IP resource:
NOTE : Each domain name label created must be unique within its Azure location.
Refer : https://learn.microsoft.com/en-us/azure/virtual-network/ip-services/public-ip-addresses#dns-name-label
https://learn.microsoft.com/en-us/azure/virtual-network/ip-services/virtual-network-public-ip-address#view-modify-settings-for-or-delete-a-public-ip-address
3) Go back to the Application gateway resource overview:
Now, you can see the DNS name/URL for the Application gateway in the Frontend Public IP address section and you can use this URL to access the Application gateway from a browser.
Kindly let us know if the above helps or you need further assistance on this issue.
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.