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On Sat, Sep 10, 2016 at 07:36:11PM +0200, Andre Majorel wrote:
> Is there a tool which would take IPv4 addresses on the command
> line and say whether or not they are regular and routable ?
>
> host(1) is not very useful for that as it doesn't seem to
> distinguish between an address which happens not to used by a
> domain name at this time (eg 9.9.9.9) and one which could never
> be (eg 192.168.0.1).
- From your question I'm not sure this is the answer you are looking
for, but I'll give it a try. According to RFC 1918 [1], the following
address ranges are reserved for "private use":
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)
Note that this is for IPV4, IPV6 is probably a bit more complex :-)
[1] http://www.faqs.org/rfcs/rfc1918.html
regards
- -- t
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