The IP address 10.209.121.178 : Class A network
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 (10.0.0.0 - 10.255.255.255).
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 10.209.121.178 detail
The IP address 10.209.121.178 (IPv4 Class A network) belonging to the network 10.0.0.0 - 10.255.255.255 is written in long version 181500338.
Color obtained mathematically from the IP address: Barney purple
Addresses on the same network : 10.209.121.0 10.209.121.1 10.209.121.2 10.209.121.3 10.209.121.4 10.209.121.5 10.209.121.6 10.209.121.7 10.209.121.8 10.209.121.9 10.209.121.10 10.209.121.20 10.209.121.30 10.209.121.40 10.209.121.50 10.209.121.60 10.209.121.70 10.209.121.80 10.209.121.90 10.209.121.100 10.209.121.200 10.209.121.254 10.209.121.255