How to mask last 2 parts of an IP?

cn flag

This maybe a dumb question but I want to block all IPs in my firewall starting with 149.129.xx.xx. I'm not able to figure out what to enter in my firewall setting. The field asks me for IP/Netmask and by default sets it to /32.

So If I enter, it makes it I know how to mask the last part of the IP using but I can't understand how it works. What would be the equivalent mask if I want to cover last 2 parts of the IP?

kr flag

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