[dragonwriter]

> right now there are all of 5,500 .gov domains

Is that just domains from which web content is hosted, or just second level domains regardless of whether web content is hosted? Because I can't imagine that there are only 5,500 total .gov domains.

[konklone]

Second level domains. There are waayyyyy more subdomains, as you note. You can see some information and estimates on this here:

https://18f.gsa.gov/2017/01/04/tracking-the-us-governments-p...

We (18F, me) personally measured at least 26,000 (though some of these are used as redirects or are just error pages, etc.).