The IP address for the NBER is http://66.251.72.129/. I’d like to know the IP address for Marginal Revolution but it’s more complicated because MR is hosted by Typepad. Does anyone know if there is a numerical address for MR like that for the NBER? Please comment if you know it or can find it. Thanks in advance!
P.S. This for a classroom discussion of Domain Name Registrars that I am working on.
204.9.178.60
It’s easy to find. Just go to a command line and ping http://www.marginalrevolution.com and you’ll see it. Or, for a slightly more direct answer, use nslookup or dig.
I’ll pipe up before someone more knowledgable comes along. I don’t thik MR has its own IP address. The 204. address seems to be shared by all Typepad blogs (at least all the other ones I checked). So I’d guess that requests go to Typepad, which then directs visitors to the proper site on their servers. If you play the nice academic, you might be able to call up Typepad and have them tell you how they route things internally.
Many domains are on shared IP addresses. So what’s happening is that when you navigate to marginalrevolution.com, your browser sends a request to 204.9.178.60 and asks for pages from marginalrevolution.com and the server looks up which directory pages from marginalrevolution.com come from and sends back the page.
A bit of a clarification: the domain “marginalrevolution.com” does not have an IP address; the address(es) are assigned to individual hosts (i.e., servers) within that domain. The domain itself is a purely abstract entity; you can only assign an address to an actual thing.
Thus, when you ask for the address for Marginal Revolutions, you probably actually mean the address of http://www.marginalrevolutions.com.
Note that it’s common for an alias to be used, so that a DNS request for “marginalrevolutions.com” returns the address of the http://www... host. This is an important distinction, because if someone tries to send email to someguy@marginalrevolutions.com, the DNS request is going to ask for a different kind of record that may (and frequently does) yield an entirely different address.
“Right, I found 204.9.178.60 also but typing that into a browser will not get you to to MR the way typing in http://66.251.72.129/ gets you to the NBER that’s why I’m asking for help to find the deeper address”
As a poster said earlier, it is highly likely that hundreds, maybe thousands of domains resolve to 204.9.178.60. http://www.marginalrevolution.com is just one of them.
You’re missing an extra piece of magic…. when somebody types the characters http://www.marginalrevolution.com into their browser, the browser does two things
Firstly, it figures out that it needs to talk to the machine living at 204.9.178.60. But there’s a second step…
It doesn’t just say to that computer: “give me the web page”. It also tells it what it wants. In your case, it would say something like: “give me http://www.marginalrevolution.com/”
This is how the computer at the other end figures out which of the thousands of blogs to send to the browser.
The geek lurkers stumble out of our caves……
Thanks all. Alas, as I suspected, there is no one to one translation for a hosted website like MR so I can’t quite use it as an example. I will stick with NBER.org.
Think of the IP address (204,9,78.60) as something very similar to the adress of a building which can be a home or an apartment. Your browser is like a courrier. In both cases you are essentially telling your browser to go to the address and get the letter they have for me. In the case of the NBER, it sees the only door and gets the letter. In the case of MR it sees an apartment building and doesn’t know which door is correct.
I don’t want to nerd out to much, but typepad doesn’t have a single “server” hosting 204.9.78.60, it has a single “pool” hosting it.
I get this report from “dig”:
;; global options: printcmd
;; Got answer:
;; ->>HEADER< <- opcode: QUERY, status: NOERROR, id: 15298
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.marginalrevolution.com. IN A
;; ANSWER SECTION:
http://www.marginalrevolution.com. 250 IN CNAME marginalrevolution.blogs.com.
marginalrevolution.blogs.com. 86350 IN A 204.9.178.60
http://www.marginalrevolution.com is a CNAME for marginalrevolution.blogs.com. A CNAME is an alias, and infinitely many CNAMEs can map to the same IP address. The main server at Typepad “sees” the CNAME that’s used to get at it and internally routes to wherever “marginalrevolution” lives. (It’s likely that it’s just a bunch of database keys, and may not have its own standalone “site” with its own unique IP address).
More on CNAMEs
The big blog aggregators like Typepad and Google use server farms with enormous databases, and use the CNAME of the blog name as the primary keys into the databases. They don’t have separate servers for each blog.
Correction:
It’s conceivable that MR could be hosted on a single box, or even multiple boxes . . .
I meant that MR could still be hosted on a single, dedicated box, or even multiple boxes.
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You’re all wrong. The internet is tubes. MarginalRevolution is located inside one of them. You have to locate the right one and squeeze it, like toothpaste. After a while, it’ll all be gone. That’s why net traffic is good: it keeps the paste from leaking out of MR too quickly.
Sheesh!
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