To allow UptimeMonster IP addresses (2a01:4f8:c012:9c4a::1 IPv6 and 162.55.41.109 IPv4) in UFW (Uncomplicated Firewall) on Ubuntu, follow these steps:

1. Allow IPv6 Address

To allow the IPv6 address 2a01:4f8:c012:9c4a::1, use the following command:

sudo ufw allow from 2a01:4f8:c012:9c4a::1

2. Allow IPv4 Address

To allow the IPv4 address 162.55.41.109, use the following command:

sudo ufw allow from 162.55.41.109

3. Verify the Rules

After adding the rules, verify that they have been added correctly by checking the UFW status:

sudo ufw status

You should see entries similar to: