Are Google App Engine A/AAAA records fixed?

Question

The process for mapping a custom domain to an app engine project is documented here

The final step is updating your DNS configuration with the records (ip addresses) generated by Google.

My question is - are these records static? Put another way are the values always

for naked domains

A 216.239.32.21

A 216.239.34.21

A 216.239.36.21

A. 216.239.38.21

AAAA 2001:4860:4802:32::15

AAAA 2001:4860:4802:34::15

AAAA 2001:4860:4802:36::15

AAAA 2001:4860:4802:38::15

and

for www (or subdomains)

CNAME. ghs.googlehosted.com.

I'm asking because if these values are fixed, then I should be able to add them to the DNS at the same that I'm adding the values (TXT or CNAME) for domain ownership verification.

Yes, above mentioned IP Addresses are static (to google, not to ur app. these are shared). But nothing is permenant, should there be a change in the addresses, google will communicate and give time to change to new IP address. — Chenna Reddy

John Hanley John Hanley · Accepted Answer · 2019-10-12T19:04:57

DNS servers do not know nor care if an IP address is fixed/static. You can enter any valid number that you want. Of course, you need to enter valid information for DNS to resolve correctly.

The IP addresses for App Engine are Global IP addresses. The address assigned to your service does not change, therefore you can call them "fixed" or "static".

For additional details. These IP addresses are not actually assigned to your service. Instead, they represent the address of the Google Frontend (GFE), a type of proxy load balancer. Numerous other services will also have the same IP address. The HTTP header host is used to route traffic to the correct service.

Are Google App Engine A/AAAA records fixed?

1 Answers