Is there Limit to No. of Domains I can Add to Cert?

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. |, so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My primary domain for this cert is:

My secondary domain currently on this cert is:

My law office burned Sunday destroying the building where my office domains were hosted with certs for:

I want to run this command to add the law office domains to the 3111skyline cert:

certbot certonly --email --webroot -w /var/lib/letsencrypt/ -d,,, -d,, -d,, -d,,, -d,,

I have NOT run it yet because I don't want to trash my existing cert if this will put me over some domain limit I am ignorant of.

My web server is (include version):

Running on Archlinux: 6.3.7-arch1-1
Apache/2.4.57 (Unix) OpenSSL/3.1.1 PHP/5.6.40

(groupware package not updated for newer PHP)

The operating system my web server runs on is (include version):

(see above)

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):

certbot 2.6.0

Can I add the 3 other domains to my existing certificate?

(that will be a total of 5 domains with another 10 or so sub-domains for the host., www., and mail. forms.)

And if I recall, when I add the domains, it will reset the 90 day renewal window for my cert starting from the date of the change ?

Thanks for any help you can provide (or a link where I can find any limits on the number of domains per-cert I can have)

1 Like

Hello @drankinatty, welcome to the Let's Encrypt community. :slightly_smiling_face:

100 see Limit on number of domain in SAN - #2 by jcjones and Why SAN's Are limited to 100 domains only


Oh thank goodness. Thank you for your reply. Does my addition command line look sane for that I want to do. It appears I simply needed to add -d domain.tld,host.domain.tld for each of the domains I need to add.

Also, do I need to cancel/revoke the other currently active cert for the law office, or just let it expire on 7/11? (I've not yet had to revoke anything before)


No, and it's best that you not.


Got it. Thank you again.


This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.