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
• 91.199.212.52
• 2a02:1788:400:1ce4::/64

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).