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We can't use very 1st and last IP address of a network (like 0 or 255).Last IP address is a broadcast address but why can't we use 1st IP address?

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Question added by Saqib Mehmood , Technical Team Lead/Safety Supervisor , Xchange Technology Group
Date Posted: 2013/11/20
Mostafa Khamies Dakam
by Mostafa Khamies Dakam , Network Specialist , Libyan Fertilizer Company

Because1st IP address is the network a address (Network ID)

But first ip address of a subnet may not be "0" also last ip address may not be "255" that depends on the network mask.

Mohammed Hussein Abbas
by Mohammed Hussein Abbas , Audit , Regus Service Centre Philippines BV

I think you are asking whether .0 or .255 can ever be a host address. We can use .0 and .255 as a host address but it depends on the MASK. For example, if you have a subnet mask of255.255.255.0, the entire fourth octet should be for host with the two exceptions of .0 which is the network (this is not assigned to a host) and .255 being the last addess / broadcast address. But if we have a network address of172.16.0.0 /16, the first usable host would be172.168.0.1 and the last / broadcast address would be172.168.255.254. So0 and255 in a octet can be a valid host address. Correct me if I am wrong.

Hassan Mehsen
by Hassan Mehsen , Network Engineer , Taqniyat

The first IP represent the Network IP where this IP represent all the hosts under this network IP.

Ahmed Sami
by Ahmed Sami , IT Infrastructure Assistant Manager , Network International Payment Solutions

The Fist IP is the Network ID.

Despite that you can enable Subnet Zero, But it is discouraged.

 

You can refer to this link:

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080093f18.shtml

mohammed akram
by mohammed akram , Network Enginee , Digital Oasis Information Technology company

intial ip wont used because it is used for the routing purpose . and its a store for the default routing .

255.255.255.255  is multicast address for the routing protocol rip . so that we can't  assign for our private ip, or even public .

Muntasir Billah
by Muntasir Billah , Support Engineer , 3Net Technology

every Ip address has two parts.One for network part and anothet part for host part.In IP address first Ip required for Network bit.Thats why remaining part alotted for Host bit.

Mostafa Mohamed Mostafa Hafez
by Mostafa Mohamed Mostafa Hafez , Projects HSE Manager , DAR

network ID

Ragesh Vadakkedath Ramachandran
by Ragesh Vadakkedath Ramachandran , IT Administrator , Nippon Motor Corporation (P) Ltd

First IP .0 represent the Network ID

.255 would be a broadcasting address

A message sent to a broadcast address is typically received by all network-attached hosts, rather than by a specific host

Bekhouche Liamine
by Bekhouche Liamine , Assistant Director of IT Departement , Algeria Post

The first @ is the @ of the network Id , and you can not use it , it is reserved ..you can use it in routers by activating subnet zero ..

Nouman Qazi
by Nouman Qazi , IT Engineer , SGB Al DABAL CO. LTD.

First Ip address is the Network Address (network id), it identifies the network subnet mask , e.g if the network mask  belongs to255..0.0.0 that means its class A network , so the address's must be belongs to class A .. example :10.0.0.0

Haroon Iqbal
by Haroon Iqbal , Technical Support Engineer , DATALINK Network Systems Technology

1st IP address is the network address (Network ID) of a subnet.

In case of sub-netting,first ip address of a subnet may not be "0" and last ip address may not be "255".

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