What IP addresses do Sectigo DCV requests originate from?

Question

What IP addresses do Sectigo DCV requests originate from?

Answer

Sectigo's DCV request origin IPs are these:

178.255.81.12
178.255.81.13
91.199.212.132
199.66.201.132

To ensure that Sectigo DCV requests for AutoSSL reach your server, you must whitelist these IP addresses for port 53 (TCP & UDP) and port 80 (TCP).