topic Re: Network Class in Operating System - HP-UX

Network Class

Sarvesh A Dhuri — Fri, 02 Jul 2004 12:26:31 GMT

Hi

Why Class A Network starts from 1 to 126
Class B Network starts from 128 to 191
Class C Network starts from 192 to 223
Class D Network 224 to 239
& Class E Network from 240 to 255

Thanks in advance

Re: Network Class

Todd McDaniel_1 — Fri, 02 Jul 2004 12:40:20 GMT

I do know that the main thing that matters is what each Class will support, at least based on the subnet masking...

My guess is that it was alpha based...no rhyme or reason....

Re: Network Class

Sundar_7 — Fri, 02 Jul 2004 12:43:22 GMT

It is the first octet.

A Class

0000 0000 to 1000 0000 == 1 to 127 â 127 cannot be used it is the loopback address and 0 canot be used.

B Class

1000 0000 to 1100 0000 == 128 to 191 â

C Class

1100 0000 to 1110 0000 = 192 to 223

D Class

1110 0000 to 1111 0000 = 224 t

Re: Network Class

Shaikh Imran — Sat, 03 Jul 2004 01:16:59 GMT

Hi,

http://www.ericsson.com/support/telecom/part-h/h-3-2.shtml

Regards,

Re: Network Class

Muthukumar_5 — Sat, 03 Jul 2004 01:33:14 GMT

Hai,

There is a dafult formation allocated for every class. IPv4 address is divided as network-id and hostnumber.

class

class A 1 byte 3 byte
class B 2 byte 2 byte
class c 3 byte 1 byte
class d & 4 byte -----
class e

CLASS A - first byte
2 bit flag as 01
6 bit host id
00000001 to 01111110 = 1 to 127

We use 127 for loop back purpose.

Class B - first byte
10000000 to 1011111 = 128 to 191

Class C - first byte
11000000 to 1101111 = 192 to 223

class D - first byte
11100000 to 1110111 = 224 to 239

class E
11110000 to 1111111 = 240 to 255

I hope you asked this same at networking forum at http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=625762 :)

In addition check this link,
http://computer.howstuffworks.com/question549.htm

Regards,
Muthukumar.

Re: Network Class

Yogeeraj_1 — Sat, 03 Jul 2004 01:42:47 GMT

hi,

See:
http://www.ipcop.org/1.3.0/en/install/html/ip-addressing.html

and RFC1918 talk more about it's WHY.

hope this helps
regards
Yogeeraj

Re: Network Class

Yogeeraj_1 — Sat, 03 Jul 2004 01:49:41 GMT

hi again,

See also the article at:http://www.pcplus.co.uk/tips/default.asp?articleid=30088&page=1&pagetypeid=4&subsectionid=390

You will observe that these ranges arenâ t arbitrary. For Class A, the first bit of the address is '0', giving a range of 1 to 127 ('0' is reserved). For Class B, the first two bits are '10'. For Class C, '110' and so on.

hope this clarifies everything.

regards
Yogee