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Home > Archive > alt.certification.network-plus > December 2002 > IP address numbers
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IP address numbers
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| Chris E 2002-12-31, 12:24 am |
| I thought this was strange. I have two different study sources showing two
different IP address tables in regards to the number of addresses available
per class. For instance, one shows 126 network addresses and 16,777,214
host addresses available for a class A address, while the other shows 254
network addresses available with the same number of host addresses as
before. The first host makes more sense to me in that there are only 126
network addresses available 1-126. The 127 range is used for loopback
diagnostics and 0 and 128 cannot be used (all 0s and all 1s in binary).
I just can't figure out how the other source came up with its information.
Can anyone set me straight here?
Chris
A+
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| IP ADDRESSES
Classes First Decimal Addresses
Hosts Per Network
A 1 - 126 1.0.0.0. -
126.0.0.0 16.7 Million
B 128 - 191 128.0.0.0 - 191.255.0.0
65,546
C 192 - 223 192.0.0.0 - 223.255.255.0
254
D 224 - 239 224.0.0.0 - 239.255.255.255
Multicast Addys
E 240 - 255 240.0.0.0 -
255.255.255.254 Experimental
Broken down into Octets
Host ID can not be 0 or 255
--
RussS
MCP W2K, A+, Net+
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| Charles M. Kozierok 2002-12-31, 7:24 pm |
| In article <OW9Q9.506246$WL3.131776@rwcrnsc54>,
Chris E <evans364@mchsi.com> wrote:
} I thought this was strange. I have two different study sources showing two
} different IP address tables in regards to the number of addresses available
} per class. For instance, one shows 126 network addresses and 16,777,214
} host addresses available for a class A address, while the other shows 254
} network addresses available with the same number of host addresses as
} before. The first host makes more sense to me in that there are only 126
} network addresses available 1-126. The 127 range is used for loopback
} diagnostics and 0 and 128 cannot be used (all 0s and all 1s in binary).
} I just can't figure out how the other source came up with its information.
} Can anyone set me straight here?
In the original "classful" IP addressing scheme, There are 126 Class A
networks with 16,277,214 hosts per network. I have no idea what the
other source is talking about, but 254 * 16,277,214 is almost the entire
IPv4 address space.
peace,
-*-
charles
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