Select the IP addresses belong to university, college, or academic institutions from a given IP addresses list.

[Hongyi Zhao]

Hi all,

I want to select the IP addresses belong to university, college, or
academic institutions from a given IP addresses list. For example,
from the following IP addresses list:

...
120.136.18.167
120.50.40.184
121.133.186.164
121.74.17.78
122.155.3.145
122.160.172.24
122.49.203.249
123.108.108.147
124.120.243.152
124.217.230.88
124.217.246.242
124.83.16.231
125.129.114.149
125.243.45.13
128.151.84.46
128.237.226.86
...

Is there any quick and accurate method for this purpose? Any hints
will be highly appreciated. Thanks in advance.

Best regards.
--
.: Hongyi Zhao [ hongyi.zhao AT gmail.com ] Free as in Freedom :.

[geo...@gmail.com]

Hi,

If you mean you need a quick method of checking a list with given
public IP addresses to see which of them belong to academic
institutes, there isn't much you can do. You should check them one by
one, using a whois IP service like http://www.ip-adress.com/whois.
Of course, there are third-party utilities that check the connections
of your local IP addresses with the internet and are able to perform
DNS resolution, but you need to install and configure them properly.

Hope this helps a bit.

Giorgos

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[Barry Margolin]

In article <aopcg5la1n6ieeqas...@4ax.com>,
Hongyi Zhao <hongy...@gmail.com> wrote:

You could do reverse lookups, and check for hostnames ending in .edu,
.edu.<country>, or .ac.<country>.

--
Barry Margolin, bar...@alum.mit.edu
Arlington, MA
*** PLEASE don't copy me on replies, I'll read them in the group ***

[glen herrmannsfeldt]

Barry Margolin <bar...@alum.mit.edu> wrote:
> In article <aopcg5la1n6ieeqas...@4ax.com>,
> Hongyi Zhao <hongy...@gmail.com> wrote:

(big snip)

>> Is there any quick and accurate method for this purpose? Any hints
>> will be highly appreciated. Thanks in advance.

> You could do reverse lookups, and check for hostnames
> ending in .edu, .edu.<country>, or .ac.<country>.

and then, in Sun tradition, do the forward lookup and verify
that one of the returned addresses is the one you started with.

That verifies that nameservers belonging to the host instititution
actually agree with the reverse.

Otherwise, I can put any value in my PTR records, and pretend
to be an academic institution.

-- glen