The IP address 10.121.217.255 : 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 10.121.217.255 detail
The IP address 10.121.217.255 (IPv4 Class A network) belonging to the network 10.0.0.0 - 10.255.255.255 is written in long version 175757823.
Color obtained mathematically from the IP address: Greyish
Addresses on the same network : 10.121.217.0 10.121.217.1 10.121.217.2 10.121.217.3 10.121.217.4 10.121.217.5 10.121.217.6 10.121.217.7 10.121.217.8 10.121.217.9 10.121.217.10 10.121.217.20 10.121.217.30 10.121.217.40 10.121.217.50 10.121.217.60 10.121.217.70 10.121.217.80 10.121.217.90 10.121.217.100 10.121.217.200 10.121.217.254