As it turns out, Moniker doesn't host Ebooks Tree's content; it's the company that sold Ebooks Tree the domain names it uses. Examining the whois data for Ebooks Tree, one might next assume that CloudFlare (a content delivery network) is its hosting company, but apparently, it only occasionally and temporarily hosts material for Ebooks Tree. Happily, ef yeah copyright law has posted the name of Ebooks Tree's hosting company. (Thank you, willibald, for linking me to the post.) The post also discusses the confusion surrounding finding the host, and what to do if your content is still present on Ebooks Tree.

In brief: Webzilla is Ebooks Tree's hosting company. Under the DMCA, it's legally obligated to remove any infringing material from its users' sites after being properly notified of the existence of such material. To properly notify Webzilla by DMCA complaint letter, one need only use the following template.

The first line in the template is your subject line for the Webzilla contact form (https://webzilla.com/contacts.html), or the email that you send to Webzilla (legal@webzilla.com). When completing the template with your information, remember to remove the square brackets — [] — from around that information (as well as any notes that appear in square brackets).

DMCA Complaint Template
DMCA Complaint with Regard to Ebooks Tree (ebooks-tree.net) Dear Webzilla, My name is [your username] ([your email address]), and I am the author and owner of the following works, which are currently being offered for unauthorized download on Ebooks Tree (ebooks-tree.net), a site you host: Title ([Ebooks Tree link to your work]), by [your username] Authorized link: [your link to your work] Title ([Ebooks Tree link to your work]), by [your username] Authorized link: [your link to your work] [Repeat as needed.] These works may be found listed together ([Ebooks Tree link to its author page for you]), as well as by searching for "[your username]" on ebooks-tree.net. There is a link to a "Full Version" of my works at the top of the following page: "[Ebooks Tree link to its author page for you]". These works are my intellectual property. I do not give ebooks-tree.net or anyone else permission to offer these works for download, and I did not consent for them to be available on ebooks-tree.net. I have good faith belief that use of the material in the manner complained of is not authorized by the copyright owner, its agent, or the law. The information in the notification is accurate, and under penalty of perjury, that the complaining party is authorized to act on behalf of the owner of an exclusive right that is allegedly infringed. I am requesting that you require ebooks-tree.net to remove my works from the site immediately. I further request that, going forward, you require ebooks-tree.net to cease to offer any of my works for download on its site, including works that it currently may be offering for download without my knowledge due to its membership requirement. Again, this information is accurate, and under penalty of perjury, I declare that I am authorized to act on my own behalf as the author and owner of this material. Signed, [your username] [your email address]
My first post about this topic.

My second post about this topic.

My third post about this topic.