Why arent each of the following valid IP addresses?

Question

150.100.255.255
175.100.255.18
195.234.253.0
100.0.0.23
188.258.221.176
127.34.25.189
224.156.217.73
142.226.0.15

semicolon?

What you mean semicolon?

Why ask my isp when I am asking you?

OK, I've figured out 224.156.217.73 is not valid because its reserved for multicasting, but what about the others?

Whoops!
I am meant to be asking
"For the following ip addresses, determine which are valid for commercial networks and indicate why or why not".
So out of the following valid ip addresses which are valid for commercial networks ?
150.100.255.255
175.100.255.18
195.234.253.0
100.0.0.23
142.226.0.15

Answer 1

ask your ISP

Answer 2

Valid Ip Address

Answer 3

Only 3 of them are NOT valid IP addresses.

188.258.221.176 -- the 2nd octet is not valid (must be 0-255)
127.34.25.189 -- reserved for loopback
224.156.217.73 -- multicast range

Now, as to the others:

150.100.255.255 -- As assigned, it's a broadcast address, however depending upon the subnet mask it could be a valid IP address.

175.100.255.18 -- Hasn't been assigned by IANA, but it's still valid.

195.234.253.0 -- If subnetted as a class C address, it would be a network address, however as assigned by IANA (/22) it is a valid IP address.

100.0.0.23 -- Hasn't been assigned by IANA, but it's still valid.

142.226.0.15 -- It's a valid IP address.

Answer 4

150.100.255.255 -- Broadcast IP (depends on subnet it may act as a valid IP)

175.100.255.18 -- Valid IP

195.234.253.0 -- Valid IP

100.0.0.23 -- Valid IP

188.258.221.176 -- Not a Valid IP

127.34.25.189 -- Loopback

224.156.217.73 -- Multicast

142.226.0.15 -- Valid IP

Answer 5

i agree with the above person