I use LetsEncrypt for all my domains, so I am very familiar with it. However, I have always used it with very common TLDs, org, com, net, etc. Do "new" TLDs, like .rocks, work with LetsEncrypt?
I believe so, I've been able to use it with every TLD that I have tried:
.cc
.com
.icu
.net
.org
.ovh
.pw
.tk
.top
.us
.work
.xyz
And we see all kinds of TLDs come through here.
[Unless the TLD is explicitly listed on some government block list - you should be fine]
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Hi @dr00bie
rocks isn't new, see
https://publicsuffix.org/list/public_suffix_list.dat
// rocks : 2013-11-14 Dog Beach, LLC
rocks
So if a TLD is listet on the Public Suffix List, you should be able to create a certificate.
Or use the IANA list:
https://www.iana.org/domains/root/db
spa is the newest TLD - .spa Domain Delegation Data
Or use online tools like https://letsdebug.net/ (from @_az) or https://check-your-website.server-daten.de/ (own tool), there are domain name checks included.
In some cases it's possible that a domain is listed (PSL or IANA), but Letsencrypt doesn't have the newest version. But that's rare.
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Thanks for the reply. I hadn't used it before, so I guess I should've said "new to me". I really appreciate the further documentation and information to review on this question.
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Thanks for your reply! I was thinking it would, but having only used the most common TLD's, I didn't want my friend to buy a new domain that might not be compatible.
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I think in the past, the cross-signed intermediate had a resitriction for the .mil TLD. And I believe there are some restrictions to some TLDs like .ir due to some kind of block list from the USA goverment. But in principle, any TLD should work.
I myself, being a M.D. have a website with the .md TLD and for which I have a LE cert of course 
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There’s not a restriction for the entire TLD.
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Sorry, I didn't mean the entire TLD, but to some domains of that TLD, more as an example, as the US gvrmt blocklist includes domains from other TLDs too (but not 100 % sure).
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Tough crowd.
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It's the
https://www.treasury.gov/resource-center/sanctions/sdn-list/pages/default.aspx
list: TXT:
https://www.treasury.gov/ofac/downloads/sdnlist.txt
Checked my local version (used in "check-your-website"):
| TLD | num_Entries |
|---|---|
| .com | 220 |
| .ir | 123 |
| .ru | 58 |
| .net | 20 |
| .mx | 11 |
| .org | 6 |
| .ua | 6 |
| .co | 5 |
| .sy | 5 |
| .de | 5 |
| .ni | 4 |
| .my | 3 |
| .lb | 3 |
| .fi | 3 |
| .uk | 3 |
| .su | 2 |
| .cn | 2 |
| .ae | 2 |
| .ph | 2 |
| .ps | 2 |
| .rs | 1 |
| .tr | 1 |
| .tv | 1 |
| .tw | 1 |
| .ly | 1 |
| .ir/ferro_gilan | 1 |
| .af | 1 |
| .am | 1 |
| .ar | 1 |
| .bh | 1 |
| .biz | 1 |
| .by | 1 |
| .com/about/fa | 1 |
| .com/porticellomalta | 1 |
| .com/zkgrandtown | 1 |
| .cy | 1 |
| .ac/ir | 1 |
| .edu/jalili | 1 |
| .fr | 1 |
| .hr | 1 |
| .info | 1 |
| .su/about | 1 |
| .ua/en/contacts | 1 |
| .ve | 1 |
| .vn | 1 |
| .za | 1 |
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