A unicast message is a message directed to a specific device on a network (just one specific device). It would have a destination IP address that corresponds to that device.
unicast
The difference is in the IP range. The multicast IP range is 224.0.0.0 - 239.255.255.255
specific hosta specific host
A unicast address is a unique IP address assigned to a single network interface, allowing for one-to-one communication. In IPv4, an unicast address falls within the ranges of 0.0.0.0 to 223.255.255.255, excluding reserved addresses. With a default subnet mask, for example, a Class A address (1.0.0.0 to 126.255.255.255) has a default mask of 255.0.0.0, Class B (128.0.0.0 to 191.255.255.255) has 255.255.0.0, and Class C (192.0.0.0 to 223.255.255.255) has 255.255.255.0. Thus, any address within these ranges is considered a unicast address when using the corresponding default subnet mask.
Unicast transmission is a commonly used term in the technology world. Unicast transmission is essentially the sending of messages to a single network destination, which is identified by an address.
MAC and IP addresses that correspond to a destination host. Remember, Unicast is singular.
Host/destination address
IPv4 1) Header (20-60 bytes). 2) Routed Protocol. 3) Types of address: i) Unicast ii) Multicast iii) Broadcast (limited/Direct) 4) 32-bit address. 5) Address space is 2^32. 6) Format of address : Decimal dotted. 7) IP security support is optional. IPv6 1) Header is fixed (20 bytes). 2) ICMP6, IP 3) Types of address: i) Unicast ii) Multicast iii) Anycast 4) 128-bit address. 5) Address space is 2^128. 6) Format of address : colon hex notation. 7) IP security support is built in.
ARP stands for Address Resolution Protocol. This is IP's way of requesting a MAC address (or hardware address) from a host located at a certain IP address. In order for a host on a network to send a unicast packet across the network, it must know both the source and destination MAC addresses. ARP is used to obtain a MAC address similar to the way DNS is used to obtain an IP address from a domain name (www.anydomain.com).
The concept of dedicated as opposed to shared Internet Protocol (IP) hosting is very popular. The major feature of this service is that there is a dedicated IP address for one hosting account.
Stateless address autoconfig
1) Header is fixed (20 bytes). 2) ICMP6, IP 3) Types of address: i) Unicast ii) Multicast iii) Anycast 4) 128-bit address. 5) Address space is 2^128. 6) Format of address : colon hex notation. 7) IPsecurity support is built in.