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Class A private subnet

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by dwdino

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We have a situation where there is a class A subnet used in a private network. Vendors and outside technicians raise cain when troubleshooting upon realizing that the network is 1.0.0.0/8.

Now the 1.0.0.0/8 network is registered to IANA and not given to anyone that I can find. This network has been used in various settings without issue. RFC 1918 specifically states the 10/8, 172.16/12 and 192.168/16 networks for private use.

The question is - is there documentation supporting the use or none use of this network?

2 replies

by bradgalliford

What is the gain for having it 1.0.0.0/8 and not 10.0.0.0/8?? I mean it is just one more zero to type.

It's just like driving on the Right side of the road. You CAN drive on the left side and get to where you need to go.. but it would be damn confusing for other people coming into your network.

by kjell_andorsen

Using the 3 private network ranges (10.x.x.x 172.16.x.x and 192.168.x.x) is extremly common, in fact I'd say about 99% of comapnies that have more than the most basic of networks will use one of these address ranges for their internal networks. I would highly advise against using any other network address such as the one you describe since it can cause all sorts of routing issues and other problems. If you're using a 1.x.x.x IP range that hasn't been assigned to you you're simply asking for trouble. I would reccomend switching to the 10.x.x.x private network range as it will give you the exact same capabilities and none of the associated hassles.

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