Russian ip block list

1. Should I block Russian IP addresses?
2. What is a 27 IP block?
3. Is 191 a private IP?

Should I block Russian IP addresses?

Given current world events, it's in the best interest of many companies to block traffic from Russian sources. Here are some basic steps you can take to block Russian IP addresses from your systems and prevent foreign attacks.

What is a 27 IP block?

/27 denote that 27 of the 32 bits of the address are the netmask hence only 5 bits are available to differentiate the computers. However, you always lose 2 addresses for broadcast and loopback, so the result is: 2^(32–27) — 2 = 2⁵ -2 = 32–2 =30. We have only 30 usable addresses on /27 allocations.

Is 191 a private IP?

This Class range lies from 128-191. The private IP range is from 172.16. 0.0 to 172.31.