It appears to be a typo in that RFC. Notice that the header of the RFC says Errata Exist. It is not uncommon for things like that to happen.

That particular error is corrected in the errata. See the RFC Editor for the details.

Errata ID: 3485
Status: Verified
Type: Technical

Reported By: Markus Falb
Date Reported: 2013-02-18
Verifier Name: RonBonica
Date Verified: 2013-02-18

Section 2 says:

three classes of networks: Class A  
(most significant address bits '00'),  
 with 128 possible networks each and 16777216 end systems

<
It should say:

three classes of networks: Class A  
(most significant address bit '0'),
 with 128 possible networks each  
and 16777216 end systems

<
Notes:

MSB bits ’00’ would mean that only 6 bits are available for the network part and this would mean only 64 CLASS A networks.

It appears to be a typo in that RFC. Notice that the header of the RFC says Errata Exist. It is not uncommon for things like that to happen.

That particular error is corrected in the errata. See the RFC Editor for the details.

Errata ID: 3485
Status: Verified
Type: Technical

Reported By: Markus Falb
Date Reported: 2013-02-18
Verifier Name: RonBonica
Date Verified: 2013-02-18

Section 2 says:

three classes of networks: Class A  
(most significant address bits '00'), with 128 possible networks each   
and 16777216 end systems

<
It should say:

three classes of networks: Class A  
(most significant address bit '0'), with 128 possible networks each  
and 16777216 end systems

<
Notes:

MSB bits ’00’ would mean that only 6 bits are available for the network part and this would mean only 64 CLASS A networks.

It appears to be a typo in that RFC. Notice that the header of the RFC says Errata Exist. It is not uncommon for things like that to happen.

That particular error is corrected in the errata. See the RFC Editor for the details.

Errata ID: 3485 Status: Verified Type: Technical

Reported By: Markus Falb Date Reported: 2013-02-18 Verifier Name: RonBonica Date Verified: 2013-02-18

Section 2 says:

three classes of networks: Class A (most significant address bits '00'), with 128 possible networks each and 16777216 end systems

It should say:

three classes of networks: Class A (most significant address bit '0'), with 128 possible networks each and 16777216 end systems

Notes:

MSB bits ’00’ would mean that only 6 bits are available for the network part and this would mean only 64 CLASS A networks.

It appears to be a typo in that RFC. Notice that the header of the RFC says Errata Exist. It is not uncommon for things like that to happen.

That particular error is corrected in the errata. See the RFC Editor for the details.

Errata ID: 3485
Status: Verified
Type: Technical

Reported By: Markus Falb
Date Reported: 2013-02-18
Verifier Name: RonBonica
Date Verified: 2013-02-18

Section 2 says:

three classes of networks: Class A  
(most significant address bits '00'),  
with 128 possible networks each and 16777216 end systems

<
It should say:

three classes of networks: Class A  
(most significant address bit '0'),
with 128 possible networks each  
and 16777216 end systems

<
Notes:

MSB bits ’00’ would mean that only 6 bits are available for the network part and this would mean only 64 CLASS A networks.