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Youtube Server Cache

Downloading a video from Youtube, I noticed the link contained the name of my ISP, Comcast.

My question is, are Youtube video cache servers located in Youtube facilities, rented from ISPs, or do ISPs like Comcast cache videos for playback themselves? If so, does that mean Comcast/NBCUniversal has the ability to directly block or modify content for their ISP subscribers?

The video I downloaded was served from:


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That link, though, could

That link, though, could really mean anything. It might be pointing to a array of servers in a YouTube datacenter which are dedicated to Comcast traffic... or it might be pointing to YouTube cache servers which are physically located on Comcast's network in your local area.

The closer cached content is to you the better.


Well, that was just what I was trying to find out.

I was hoping someone here might know what facility such a server would likely be physically located at.

Youtube, Comcast, or maybe even 3rd party?

The address show's it's at:

o-o.preferred.comcast-sjc1.v4.lscache7.c.youtube.com ( -
3635 Concorde Parkway
Suite 200
Chantilly, VA

Registration Services Department
+1-703-227-0660 -
YouTube, Inc. YOUTUBE (NET-208-117-224-0-1) -
YouTube, Inc. YOUTUBE (NET-208-65-152-0-1) -
YouTube, Inc. YOUTUBE (NET-64-15-112-0-1) -

Google Inc

I'm just surprised it's Virgina. Or maybe, I'm in error.

Youtube Server Cache

"about:cache" is the pro way of saving vids down, but this video is showing you the long way, you can just type in "about:cache" and copy the Cache Directory underneath the 2nd heading "Disk cache device" into the windows address bar.

Yeah, but most the videos I download are not from Youtube

I only go for youtube if the original is not available.

That physical address...

is an office of the ARIN database. The database that stores geo-location data.

Not all server names can be looked up with WHOIS. Only base domain names.

I think you got that info because WHOIS errored...

~wobbles but doesn't fall down~

13% of Chantilly pop. works at National Reconnaissance Office

Chantilly was also home to the annual Bilderberg summit in 2008.


Just some interesting details, speaking of Chantilly.

The ARIN database...

was originally run by Network Solutions in Herndon, VA but they spun it off as a non-profit a few years back...

~wobbles but doesn't fall down~

I see. So that's not actually where this cache server is.

Could it actually be at Google in California then?


If so, that would mean Comcast has a Cache server at Google? Doesn't make much sense.


Or did you mean Youtube?

I'm guessing that cache server resides somewhere in your local Comcast network. Geographically and physically close to you.

I'm not convinced that is the address of that cache server.

What WHOIS did you use to look it up? I can't get any WHOIS to look it up.

That link you gave shows the ISP of the IP address as Youtube...

~wobbles but doesn't fall down~

The 208.x.x.x block...

is owned by Youtube. But still not enough info to know where the server resides geographically...

~wobbles but doesn't fall down~

So what is a good tool to trace exactly where this server is?

I can try the download again to actively monitor it.

None really...

the ARIN database is the best public source but it isn't really precise sometimes, sometimes only giving state, and it mostly won't contain info for specialty network servers.

~wobbles but doesn't fall down~


if the server cache is at Youtube it would do less good for Comcast's network.

Secondly, why would Youtube dedicate part of their network just to Comcast? It would make no difference to Youtube where the requests are coming from. Caches are used to reduce external traffic in and out of gateways to local networks.

Also, if the cache resided at Youtube it would not eliminate backbone hops thus reducing overall internet traffic.

The biggest benefit is if the ISP has multiple cache servers distributed locally/regionally.

~wobbles but doesn't fall down~


benefits both the ISP and content provider. Normally, for large-scale high-traffic content providers, the ISP owns the cache server and the server is part of the ISP's network but the ISP lets the content provider manage the cache.

~wobbles but doesn't fall down~

So in this case, does Comcast/NBCUniversal have access?

Or control of what I'm seeing, or not seeing, if they wanted?

Without anyone else being able to know?

It's possible...

but I can't think of a reason why they would. But Comcast could certainly intercept requests to Youtube and spoof content or block it.

~wobbles but doesn't fall down~

"copyright" or " cyber terrorism"

It seems "copyright" and "cyber terrorism" are the excuses the establishment is using to further intrude upon and control the Internet, in other words, the information people have access to.

NBC/Universal is certainly "the establishment," as the head of NBC said himself.


but that would be more easily handled at Youtube than at each ISP.

~wobbles but doesn't fall down~

Interests would be different wouldn't they?

Google compared to NBC?


even though Comcast won that lawsuit about them being able to shape certain types of traffic I don't think they are legally brave enough yet to manipulate specific content. The spirit of net neutrality still lives on (thankfully)... :p

~wobbles but doesn't fall down~