Missing IP Address range: 223.255.255.1-254?

[Gags]

Hello Cisco Community,

I'm preparing for CCNA and to have a better understanding, I was creating an ip-range chart. However, I have some confusion regarding the IP Address ranges, I've noticed some websites mention the Class C ranges from 192.0.0.0 to 223.255.255.0 while others suggest:192.0.0.0 to 223.255.255.255

I was going through the Cisco's document and noticed the ip-range is missing from 223.255.255.1 to 223.255.255.254

Here's a comparison with an article found on Wiki (I've noticed the same discrepancy on other sites as well): 

Can someone confirm what should be the correct range for the class C addresses? If the Class C ranges from 192.0.0.0 to 223.255.255.0 then what are remaining addresses being used for (223.255.255.1 to 223.255.255.254)?

Thanks,
Gagan Singh

[M02@rt37]

Hello @Gags,

Class C historically was 192.0.0.0 to 223.255.255.255 (based on classful addressing). In modern CIDR, the entire range from 192.0.0.0 to 223.255.255.255 is considered Class C and is denoted as 192.0.0.0/3.

[paul driver]

Hello
A class C range =192.0.0.0/24 <> 223.255.255.0/24, and the vary last class C /24 subnet  from this range will be 223.255.255.0/24 and its last ip address within that last subnet will be 223.255.255.255 (a broadcast address)

whole subnet
223.255.255.0 <subnet address>
223.255.255.1 – 254 < ip address range>
223.255.255.255 <broadcast address>

within that whole class C range there is also a RFC1918  non-routable address range, which can be used internally on a network but not externally <on the public internet>

192.168.0.0     -   192.168.255.255 <192.168.x.x/16 prefix>

[MHM Cisco World]

..

[paul driver]

@MHM Cisco World 
your mistaken - it’s 224.0.0.0 to 239.255.255.255 that is .

[Joseph W. Doherty · Accepted solution]

Perhaps you're confusing address space range with subnet blocks.

The Class C address block's IP address space is from 192.0.0.0 to 223.255.255.255, is as shown in your last table.

However as each Class C is a 24 address block, in CIDR notation, the first Class C address would be 192.0.0.0/24 and the last 223.255.255.0/24.  Each Class C address block's last octet, for all its addresses, would be in the range of 0..255.  For each of those, as we set aside the first IP for the network, and the last IP for broadcast, host IPs would be 1..254.