UPDATE - There seems to be some questions about whether you have to own the domain to create sub domains. I found this for you all to peruse, and interpret:
IF I OWN A DOMAIN, DO I OWN ALL OF IT'S SUBDOMAINS?
"Yes, you own and control the entire namespace below the domain you purchase, because DNS is hierarchical. Creating mail.example.com and blog.example.com is just a matter of adding entries to the DNS zone that you control.
Since you asked about the name. domain, I'll address that specifically: You cited its eligibility requirements and have confused this with domain control. If you aren't eligible to have the domain to begin with, then the point is moot."
That seems clear enough. You have to own the root domain.
Rationally if anyone could create a public sub-domain under a TLD owned by another then once could subvert the entire domain with redirects. Imagine trumpsucks.whitehouse.gov. it makes no architectural sense from an IT perspective.
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Earthbalance2 ago
I don't know of any tool that tracks the age of sub-domains. Per the public records for the master domain:
https://www.whois.com/whois/cometpingpong.com
The master was registered in 2007 and updated in October, 2018.
https://serverfault.com/questions/469342/is-there-a-way-to-check-dns-records-to-determine-the-creation-date-of-a-subdomai
The screenshots don't declare the age of the sub domains. I also don't think someone can create sub domains for a domain they don't control.
Lynnwiod ago
UPDATE - There seems to be some questions about whether you have to own the domain to create sub domains. I found this for you all to peruse, and interpret:
IF I OWN A DOMAIN, DO I OWN ALL OF IT'S SUBDOMAINS?
https://serverfault.com/questions/537310/if-i-own-a-domain-do-i-own-all-of-its-sub-domains
Earthbalance2 ago
"Yes, you own and control the entire namespace below the domain you purchase, because DNS is hierarchical. Creating mail.example.com and blog.example.com is just a matter of adding entries to the DNS zone that you control.
Since you asked about the name. domain, I'll address that specifically: You cited its eligibility requirements and have confused this with domain control. If you aren't eligible to have the domain to begin with, then the point is moot."
That seems clear enough. You have to own the root domain.
Lynnwiod ago
That’s the way I read it too.
Earthbalance2 ago
Rationally if anyone could create a public sub-domain under a TLD owned by another then once could subvert the entire domain with redirects. Imagine trumpsucks.whitehouse.gov. it makes no architectural sense from an IT perspective.