Question: Can The First Octet Of An IP Address Be 0?

What is FFFF FFFF MAC address?

The broadcast MAC address is an address where all positions are set to F (FFFF:FFFF:FFFF).

RARP is used to find the IP address when the MAC address is already known..

What is 192.168 called?

192.168. 1.1 is a common factory IP address for a consumer-grade router. If the router is used for connecting to the Internet then all computers and devices which access the Internet through it will use this address as their default gateway.

Why 0 and 127 are not used in IP address?

The class A network number 127 is assigned the “loopback” function, that is, a datagram sent by a higher level protocol to a network 127 address should loop back inside the host. … As 0 was used for pointing to a specific host, 127 was left for loopback.

Can an IP address start with 0?

All IP addresses in a Class A network start with zero. Class B Networks: Class B networks are very large, but nowhere near the size of a Class A network. A Class B network—there are more than 16,000 of them—can handle more than 65,000 hosts.

Is 255.255 255.255 IP address valid?

No 255.255. 255.255 can’t be allocated to a host, because it is used as limited broadcast address(destination) i.e. when any host wants to broadcast information to all the hosts in its entire network it will assign the destination ip as 255.255. 255.255(ie send to all).

What does IP route 0.0 0.0 0.0 0.0 mean?

Explanation. IP route 0.0. 0.0 0.0. 0.0 Fa0/0 in plain English means “packets from any IP address with any subnet mask get sent to Fa0/0”. Without any other more specific routes defined, this router will send all traffic to Fa0/0.

What does a gateway of 0.0 0.0 mean?

The address 0.0.0.0 generally means “any address”. If a packet destination doesn’t match an individual address in the table, it must match a 0.0.0.0 gateway address. In other words, default gateway is always pointed by 0.0.0.0: route -n.

What does 24 mean in IP address?

This means that this IP address is in the subnet = 192.168. 1.0 with subnet mask = 255.255. 255.0. Shorthand (AKA CIDR, Classless Inter-Domain Routing), this can be written 192.168. 1.0 /24 where the ‘/24’ represents the number of subnetwork bits active in the mask.

What is the use of 0.0 0.0 IP address?

As a source address in IPv4 broadcasting within a local area network; On servers, to designate a service may bind to all interfaces; and. On PCs and client devices, a 0.0. 0.0 address indicates that the client isn’t connected to a TCP/IP network, and a device may give itself a 0.0.

What is the 3rd octet of an IP address?

A Class B address has the first and second octets as the network portion and the third and fourth octets as the host portion. A Class B network mask is shown as 255.255. 0.0. A Class C address has the first, second, and third octet as the network portion and the last octet as the host portion.

What is a usable IP address?

Usable IPs is the Total IPs minus the Network and Broadcast IPs. CIDR. Subnet Mask.

Can the last octet of an IP address be 0?

Remember, again, that binary host addresses with all ones or all zeros are invalid, so you cannot use addresses with the last octet of 0, 63, 64, 127, 128, 191, 192, or 255. You can see how this works by looking at two host addresses, 192.168.

What destination adress is 255.255 255.255 for?

255.255. 255.255 — This address is reserved for network broadcasts, or messages that should go to all computers on the network. 127.0. 0.1 — This is called the loopback address, meaning your computer’s way of identifying itself, whether or not it has an assigned IP address.

What is a 255.255 subnet?

A subnet mask of 255.255. 255.0 allows for close to 256 unique hosts within the network (since not all 256 IP addresses can be used). … Most home networks use the default subnet mask of 255.255. 255.0. However, an office network may be configured with a different subnet mask such as 255.255.

What IP address Cannot be used?

Two addresses that cannot be used in your example are 192.168. 123.0 and 192.168. 123.255 because binary addresses with a host portion of all ones and all zeros are invalid. The zero address is invalid because it is used to specify a network without specifying a host.

What valid host range is the IP address?

The last three octets are zeros because the first octet is a 10, which is in the Class A range of 1-126. To find the broadcast address of the IP address, turn on the host bits: 10.255. 255.255. The valid hosts are the numbers in between the network address and the broadcast address: 10.0.