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Private IP Schemes

I have a company with 13 offices. Each of the offices has anywhere from 6 - 40 nodes. Also I am considering VOIP so I may need some address for that. Currently I have a site to site VPN with configure each site with the following IP's ranges;

172.16.0.0916 Site 1

172.17.0.0/16 Site 2

172.18.0.0/16 Site 3

172.20.0.0/16 Site 4

172.21.0.0/16 Site 5

172.22.0.0/16 Site 6

172.23.0.0/16 Site 7

172.24.0.0/16 Site 8

172.25.0.0/16 Site 9

172.26.0.0/16 Site 10

172.27.0.0/16 Site 11

172.28.0.0/16 Site 12

172.26.0.0/16 Site 13

I have been told that these are not valid private address. Are these valid address? If not what would be a good address scheme? Are there any sample private IP schemes that I can look at?

A couple of other notes:

Thanks

Kevin

2 ACCEPTED SOLUTIONS

Accepted Solutions
New Member

Re: Private IP Schemes

The Internet Assigned Numbers Authority (IANA) has reserved three blocks of the IP address space for private internets:

10.0.0.0 - 10.255.255.255 (10/8 prefix)

172.16.0.0 - 172.31.255.255 (172.16/12 prefix)

192.168.0.0 - 192.168.255.255 (192.168/16 prefix)

Reference RFC1918

Hall of Fame Super Silver

Re: Private IP Schemes

Kevin

As Nick points out there are reserved addresses for private use which include addresses in the range 172.16.0.0 through 172.31.255.255. So in general I am not sure what the objection was and believe that what you list are valid private addresses.

There are a couple of details in what you posted that probably are errors in typing (but if not they would present problems with your addressing scheme). You list these ranges:

172.26.0.0/16 Site 10

172.26.0.0/16 Site 13

I am assuming that you meant 172.29.0.0 for site 13.

I also note that you skipped over address 172.19.0.0 and am not sure if it was on purpose or not.

HTH

Rick

3 REPLIES
New Member

Re: Private IP Schemes

The Internet Assigned Numbers Authority (IANA) has reserved three blocks of the IP address space for private internets:

10.0.0.0 - 10.255.255.255 (10/8 prefix)

172.16.0.0 - 172.31.255.255 (172.16/12 prefix)

192.168.0.0 - 192.168.255.255 (192.168/16 prefix)

Reference RFC1918

Hall of Fame Super Silver

Re: Private IP Schemes

Kevin

As Nick points out there are reserved addresses for private use which include addresses in the range 172.16.0.0 through 172.31.255.255. So in general I am not sure what the objection was and believe that what you list are valid private addresses.

There are a couple of details in what you posted that probably are errors in typing (but if not they would present problems with your addressing scheme). You list these ranges:

172.26.0.0/16 Site 10

172.26.0.0/16 Site 13

I am assuming that you meant 172.29.0.0 for site 13.

I also note that you skipped over address 172.19.0.0 and am not sure if it was on purpose or not.

HTH

Rick

New Member

Re: Private IP Schemes

Yes those were typos.

Thanks Nick and Rick.I was starting to doubt myself. In the past month a senior tech at an ISP and a programmer with a PHD told me it was wrong.

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