[muglo] Re: searches
- From: "Eric D." <hideme666@xxxxxxxxxxx>
- To: <muglo@xxxxxxxxxxxxx>
- Date: Wed, 13 Nov 2002 11:50:47 -0500
on 12/11/02 20:58, Mary at iMary@xxxxxxxxxxxx wrote:
>> They are indeed grabbing the .ca.
>
> Do you know how Google does that, Joe?
They do a "DNS (domain name server) lookup" on your IP address.
So, let's say 122.51.33.8 is the IP your ISP has assigned to you for this
dialup (dialup IPs are never assigned to one particular person), and you are
with macsrule.ca as your ISP.
They have "ownership" (been assigned) over a certain number of IP addresses,
let's say 122.51.30.0->122.51.40.0. This would give them a total of ~2700 IP
addresses (256*11 - IP addresses that are often "reserved"). Each of these
addresses can be assigned a sub-domain "name", so they may decide to use a
number scheme like Bell does: 122.51.33.8 = london55.macsrule.ca.
It's very simple for them to do a "whois" on your IP address (which *has* to
be sent to them if you are to receive a web page... without a return
address, how would they know where to send your search results ;), and find
out what your registered name is. If .ca is at the end of your name their
server will send back Canada-relevant pages to you.
Note: a proxy server gets around that by acting as a go-between between you
and your destination, so your destination thinks that you are actually
coming from the proxy server's domain. For the U of T the proxy server
allows any U of T-affiliated person to access the web from home (e.g. Bell),
but still be allowed password-free access to sites that restrict access to
only the U of T domain (e.g. on-line journals, or on-line licence limited
resources (e.g. on-line Oxford English dictionary)).
PS IP addresses take the format 255.255.255.255 (0-255, each address is 32
bits long, broken up into 4 8 bit units).
PS2 IPNetMonitor is a good app for OS 9, and in OS X this functionality is
built-in.
L8r, Eric.
Users can subscribe to the List by sending an email to
<muglo-request@xxxxxxxxxxxxx> with 'subscribe' in the Subject field
Users can unsubscribe from the List by sending an email to
<muglo-request@xxxxxxxxxxxxx> with 'unsubscribe' in the Subject field
Users must send messages or replies to <muglo@xxxxxxxxxxxxx>
All messages are archived so that you can view them at any time by
going to <//www.freelists.org/archives/muglo>
Problems concerning use of the FreeList should be sent to
<paulthomas@xxxxxxx>
Don't forget to periodically check our web site at:
http://muglo.on.ca/
Other related posts: