I'm a brother shill but a while back they experimented with a consumer-hostile firmware update for one of their models.
Since then, I've been edge blocking the rdns of update.brother.co.jp. It usually resolves to 4 IPv4 addys. Depending on the DNS resolver, they should lie in one of these subnets.
3.164.143.0/24 # per asia dns
13.249.98.0/24 # per us dns
18.154.219.0/24 # can't recall
18.155.68.0/24 # per alibaba dns
18.160.225.0/24 # per he.net
edit: It looks like Brother is using cloudfront to provide CDN services. Every region I try I get a diff subnet. Better to query yourself than rely on my IPs.
Since then, I've been edge blocking the rdns of update.brother.co.jp. It usually resolves to 4 IPv4 addys. Depending on the DNS resolver, they should lie in one of these subnets.
edit: It looks like Brother is using cloudfront to provide CDN services. Every region I try I get a diff subnet. Better to query yourself than rely on my IPs.