The IP address 172.30.218.221 : 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 172.30.218.221 detail
The IP address 172.30.218.221 (IPv4 Class B networks) belonging to the network 172.16.0.0 - 172.31.255.255 is written in long version -1407264035.
Color obtained mathematically from the IP address: Vibrant purple
Addresses on the same network : 172.30.218.0 172.30.218.1 172.30.218.2 172.30.218.3 172.30.218.4 172.30.218.5 172.30.218.6 172.30.218.7 172.30.218.8 172.30.218.9 172.30.218.10 172.30.218.20 172.30.218.30 172.30.218.40 172.30.218.50 172.30.218.60 172.30.218.70 172.30.218.80 172.30.218.90 172.30.218.100 172.30.218.200 172.30.218.254 172.30.218.255