Are Google App Engine A/AAAA records fixed?

[NP]

Hello,

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

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

for naked domains 

and CNAME.    ghs.googlehosted.com. for www (or subdomains)?

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. 

[Yasser Karout]

Hello,

You can do them at the same time but it would be better to first verify then add them to to the DNS.