1. Internet Protocol CLASS E

2. IP Address Class E and Limited Broadcast
The IPv4 networking standard defines Class E addresses as reserved, meaning that they should not be used on IP networks.
Some research organizations use Class E addresses for experimental purposes.
However, nodes that try to use these addresses on the Internet will be unable to communicate properly.

3. Class E - Class E is used for experimental purposes only
Class E - Class E is used for experimental purposes only. Like Class D, it is different from the first three classes. It has a first bit value of 1, second bit value of 1, third bit value of 1 and fourth bit value of 1. The other 28 bits are used to identify the group of computers the multicast message is intended for. Class E accounts for 1/16th of the available IP addresses.
Net  Host or Node  240.   

4. /4 - This block, formerly known as the Class E address space, is reserved. The "limited broadcast" destination address should never be forwarded outside the (sub-)net of the source. The remainder of this space is reserved for future use. [RFC1700, page 4]

5. CLASS E
 used for experimental purposes only and you cannot assign these IP addresses to your devices.
Four left most bits of the left most octet of a "Class E" network is reserved as "1111".
The minimum possible value for the left most octet in binaries is (decimal equivalent is 240) and the maximum possible value for the leftmost octet is (decimal equivalent is 255). Therefore for a "Class E" IP address, leftmost octet must have a value between (240.X.X.X to 255.X.X.X).

6. IP Range Uses Unicast Multicast Experimental Class Address Change
support
Unicast
Class A to
Supports 16 million hosts on each of 127 networks.
Class B to
Supports 65,000 hosts on each of 16,000 networks.
Class C to
Supports 254 hosts on each of 2 million networks.
Multicast
Class D to
Reserved for multicast groups.
Experimental
Class E to
Reserved for future use, or Research and Development Purposes.

7. Class D & E Range CIDR IP Range Number of Unique Addresses Locality
Purpose /4 –
Global
Reserved for multicast assignments as specified in RFC 3171 /4 –
is reserved for the "limited broadcast" destination address. All others in this block are reserved for future allocation by the IANA.

8. IANA
The Internet Assigned Numbers Authority (IANA) is the entity that oversees global IP address allocation, root zone management in the Domain Name System (DNS) and other Internet Protocol- related symbols and numbers. IANA is operated by the Internet Corporation for Assigned Names and Numbers, also known as ICANN.

9. Size of network number bit field
Class
Leading bits
Size of network number bit field
Size of rest bit field
Number of networks
Addresses per network
Start address
End address
Class A
    0
    8
    24
    128 (27)
    16,777,216 (224)
Class B
    10
    16
    16,384 (214)
    65,536 (216)
Class C
    110
    2,097,152 (221)
    256 (28)
Class D (multicast)
    1110
    not defined
Class E (reserved)
    1111

10. Binary Representation
Class E   = =

11. In the below table,. N denotes the network ID bits,
In the below table, N denotes the network ID bits, H denotes the host ID bits, M denotes the multicast address bits and R denotes reserved bits.
Class A
0NNNNNNN.HHHHHHHH.HHHHHHHH.HHHHHHHH
Class B
10NNNNNN.NNNNNNNN.HHHHHHHH.HHHHHHHH
Class C
110NNNNN.NNNNNNNN.NNNNNNNN.HHHHHHHH
Class D
1110MMMM.MMMMMMMM.MMMMMMMM.MMMMMMMM
Class E
1111RRRR.RRRRRRRR.RRRRRRRR.RRRRRRRR

12. Automatically assigned addresses
These default addresses are what allow your computer and other network devices to communicate and broadcast information over your network.
0 is the automatically assigned network address.
1 is the commonly used address used as the gateway.
2 is also a commonly used address used for a gateway.
Addresses beyond 3 are assigned to computers and devices on the network.
255 is automatically assigned on most networks as the broadcast address.