Question

Which of the following are Public IP and which are Private IP addresses?

a) 10.12.4.3/8

b) 126.21.32.3/8

c) 193.168.1.1/24

d) 172.17.0.1/16
b,c – Public
a,d – Private
a,c – Public
b,d –Private
a,b – Public
c,d – Private
a,b,c – Public
d – Private

Answer 1

To identify which of the given IP addresses are Public and which are Private, we can refer to the ranges defined for private IP addresses:

1. **Private IP ranges:**
- 10.0.0.0 to 10.255.255.255 (10.0.0.0/8)
- 172.16.0.0 to 172.31.255.255 (172.16.0.0/12)
- 192.168.0.0 to 192.168.255.255 (192.168.0.0/16)

2. **Public IP addresses** are any IP addresses that do not fall within the private IP ranges indicated above.

Now let's evaluate each IP:

a) **10.12.4.3/8** - This is a private IP address (belongs to the 10.0.0.0/8 range).

b) **126.21.32.3/8** - This is a public IP address (it does not fall within the private ranges).

c) **193.168.1.1/24** - This is a public IP address (it does not fall within the private ranges).

d) **172.17.0.1/16** - This is a private IP address (it falls within the 172.16.0.0 to 172.31.255.255 range).

Based on this evaluation:
- Private IP addresses: a) 10.12.4.3/8 and d) 172.17.0.1/16
- Public IP addresses: b) 126.21.32.3/8 and c) 193.168.1.1/24

Therefore, the correct classification is:
- a, d – Private
- b, c – Public

So the answer would be:
**b,c – Public; a,d – Private**.