Re: Tool that says whether IP addresses are routable or reserved
On Sat, 10 Sep 2016 19:58:50 +0200
<tomas@tuxteam.de> wrote:
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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 :-)
>
There are a lot more reserved for other unspecified reasons. The list
of more than 165,000 address blocks here http://software77.net/geo-ip/
contains quite a few listed 'reserved'. The list is frequently updated.
--
Joe
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