I'm using Firefox with Flagfox, an add-on that "displays a country flag depicting the location of the current website's server":
https://addons.mozilla.org/en-US/firefox/addon/flagfox/
Here's what it tells me about e621:
Domain Name: e621.net
IP Address: 190.93.255.70
Server Location: Costa Rica
I don't know if this is the actual location of the e621 server, or of the DDOS protection service it uses.
If you use Firefox, please install Flagfox and post the information it displays for e621.
Updated by NotMeNotYou