The IP address 172.20.133.0 : Class B networks
Secure IP address This IP is only local, it is not accessible from outside the network
Rating: 5
This means that the IP address is not accessible from the Internet, it is local and only accessible within the network. Everyone has the same local address (172.16.0.0 - 172.31.255.255).
Each device (laptop, printer, scanner, phone, surveillance camera, tablet, ...) has a unique local IP address assigned by the adsl box that allows the box to identify the different devices to within a local network and send the right product at the right flow.
Specifically, the adsl box has a public IP address in your case, which connects to the Internet and the box assigns a local address to all devices to identify them.
The IP address 172.20.133.0 detail
The IP address 172.20.133.0 (IPv4 Class B networks) belonging to the network 172.16.0.0 - 172.31.255.255 is written in long version -1407941376.
Color obtained mathematically from the IP address: Barney purple
Addresses on the same network : 172.20.133.1 172.20.133.2 172.20.133.3 172.20.133.4 172.20.133.5 172.20.133.6 172.20.133.7 172.20.133.8 172.20.133.9 172.20.133.10 172.20.133.20 172.20.133.30 172.20.133.40 172.20.133.50 172.20.133.60 172.20.133.70 172.20.133.80 172.20.133.90 172.20.133.100 172.20.133.200 172.20.133.254 172.20.133.255