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Cisco > CCNA > Why have certain address range been chosen as private

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Author Why have certain address range been chosen as private
Hippo
Practising member




Registered: Jan 2001
Location: Milton Keynes, England
Country: England
State:
Certifications: CCNA
Working on: Gave up with routing; gone switching instead.

Total Posts: 939
Question

Hi y'all

Class A address range 10.0.0.0
Class B address range 172.16.0.0 - 172.31.0.0
Class C address range 192.168.0.0

are all reserved for private use and should NOT be propagated across public networks.

Yeah, you know that; but does anyone know why these address ranges were chosen.

Look at that!

Cheers
Hippo.

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Old Post 01-26-01 06:38 PM
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JerryL
Senior Member
M




Registered: Jul 2000
Location: Winnipeg
Country: Canada
State: MB
Certifications: A+, Network+, i-Net+, Server+, CAP, CCNA, CHDM, CIW Assoc., CNA, Dell, HP, IBM, MCP
Working on: MCSE Win2K3

Total Posts: 472
Post

Hi Hippo;

There are two primary reasons that the "private" IP ranges were created:

1)hosts that do not require access to hosts in other networks or the Internet in general, but still require the hierarchical structure; and

2)hosts that only require limited access for such apps as e-mail, remote login, etc. For much of this, the host would be going through a gateway at any rate.

If you want to read the full rfc on this, the address is: www.ietf.org/rfc/rfc1918.txt

Hope this helps;

JerryL


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Silkysmoothe1
Member




Registered: Dec 2000
Location: Dallas
Country: America,
State:
Certifications: yes!
Working on:

Total Posts: 355
Lightbulb

Kool!

by reading this thread, my insight grew stronger. ATTACK! ATTACT! ccna soon to be,,hopefulley. Always,,,,,nice threads guys.

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