It's loosely based upon the geographic location of the organization
requesting IP addresses _directly_ from ARIN, or another Regional NICs:
Examples of other regional NICs include RIPE, for our European friends,
APNIC, for those in the Asian Pacific parts of the world, and others broken
down within the Americas.
--- snip ---
ARIN allocates IP address space within geographical areas including, but not
limited to, North America, South America, sub-Saharan Africa, and the
Caribbean. Organizations located outside ARIN's geographical area of
responsibility should contact their appropriate Regional Registry for
information on procedures for obtaining IP address space.
--- snip ---
Now, if your upstream provider is a national/international one, like Sprint,
or something, then they have a huge blocks assigned to them for North
America, or whatever, by ARIN. They can then hand out those IP addresses
to you in any way they see fit. I'm sure most large providers further hand
them out on a geographic basis (it only makes sense), but you can't count on
it .. so I wouldn't rely on anything more than the region to which they were
assigned. Most of the responsible upstreams use a naming convention in
their routes that sort-of tell you where the route is coming from, but then
again, this is hardly reliable.
For example, even though your E-mail address gives away where you are, I can
still get the route info from me to you:
4 140 ms 140 ms 140 ms e0.r02.scrchl.infoave.net [165.166.125.18]
5 150 ms 140 ms 140 ms atm8-0-7.gwy.ncchrl.infoave.net
[165.166.126.148
]
6 150 ms 160 ms 150 ms sl-gw21-atl-2-3.sprintlink.net
[160.81.204.1]
7 160 ms 150 ms 161 ms sl-bb20-atl-4-0.sprintlink.net
[144.232.12.17]
8 170 ms 171 ms 170 ms sl-bb22-fw-10-0.sprintlink.net
[144.232.18.21]
9 170 ms 170 ms 170 ms sl-gw37-fw-9-0.sprintlink.net
[144.232.11.170]
10 190 ms 181 ms 200 ms sl-stateil-7-0.sprintlink.net
[144.232.223.62]
11 190 ms 191 ms 180 ms mail.ioc.state.il.us [163.191.177.20]
Line 4 tells me Rock Hill, SC
Line 5 tells me Charlotte, NC
Lines 6 and 7 suggest Atlanta, GA
Lines 8 and 9, I'm not sure about, at just a passing glance
Line 10 strongly suggests the state of IL
Line 11 pretty much backs up line 10 and says it all :)
Oops .. my network admin is showing .. how embarrassing .. *covers up
quickly* ;) Hehe .. that's much more info than you asked about. Check out
http://www.arin.net/regserv.html and the rest of the ARIN site for more
specific answers to your questions and links to other NICs.
Todd
----- Original Message -----
From: "Andrew Peterson" <[EMAIL PROTECTED]>
To: "CF-Community" <[EMAIL PROTECTED]>
Sent: Monday, August 13, 2001 3:09 PM
Subject: How are IP addresses assigned?
> Hi,
>
> I would like to know how IP addresses are assigned. Is it geographic, like
> zip codes? Random? Incremental? Is there a primer I can download? I'm
> curious as to how it's done.
>
> Thanks!
>
> 8-) Andrew
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