I work behind an really annoying firewall, and I just want the net admin to add all the SE websites to the whitelist. Right now I've lost access to Stack Overflow's authentication, but not Meta's... so I have to come here before I log in there.

It's driving me nuts. Basically I just want to add an exclusion rule for all SE domains; not only the website domains, but also the content domains such as gravatar.com, quantserve.com, the domain that holds static content, etc...

  • I your bit about the content domains right when the site hiccupped for me and I couldn't get back into change my answer for a couple of minutes... Sorry!
    – squillman
    Mar 2, 2011 at 16:35
  • 20
    This question screws with my head. Asked March 2nd, 2011. Answered June 18th, 2010.
    – J. Steen
    Dec 11, 2012 at 11:11
  • 2
    @J.Steen the mysterious magic of merging...
    – AakashM
    Dec 11, 2012 at 11:28
  • 13
    The truth is I'm a time traveler.
    – Incognito
    Dec 11, 2012 at 13:30
  • @Peanut the subdomains tag should be used for actual sub domains of stackexchange.com, however domains like sstatic.net, gravatar.com etc are not, by any means, such sub domains. This tag does not fit here. May 22, 2016 at 10:30
  • Related: How many TLDs are currently owned by Stack Overflow?
    – V2Blast StaffMod
    Jun 8 at 16:32

2 Answers 2


I'm a Community Wiki answer; please update me!

Stack Exchange sites can be found on these domains (or subdomains, e.g. *.stackexchange.com (including *.meta.stackexchange.com)):

The following domains (and in most cases their subdomains) are necessary to view Stack Exchange content and participate on Stack Exchange:

  • ajax.googleapis.com — for some JavaScript (jQuery, etc.)
  • i.stack.imgur.com — for most user images
  • cdnjs.cloudflare.com — for MathJax (for sites with math formatting) (as of April, 2017) — for most SE sites
  • *.sstatic.net — for static content (JavaScript, CSS, images, etc.)
  • stacksnippets.net — for code snippets on Stack Overflow

These ones are required for "normal" site usage on any site. In other words, if you just want to let your employees browse and post on Stack Overflow, but not waste time at Arqade, then you'll need to include Stack Overflow and all these dependencies.

The following additional domains are required to enable additional features:

  • stackauth.com — for global login
  • *.gravatar.com — to see user avatars of users using Gravatar
  • graph.facebook.com — to see user avatars of users using their Facebook profile photo
  • *.googleusercontent.com — to see user avatars of users using their Google profile photo
  • *.quantserve.com, *.google-analytics.com, *.scorecardresearch.com

You can get a complete (and always up to date) list of Stack Exchange site URLs from the API. There are wrapper libraries in many languages for reading the API.

  • I included grav and quant because they loaded up in the resources for the site. Mind you, so does google.
    – Incognito
    Mar 2, 2011 at 16:34
  • Neither one of them is in my NoScript whitelist and the sites all work fine, including seeing avatars. I have no idea what quantserve does, though. EDIT: and now I do know what quantserve does. Thanks, @Grace!
    – Pops
    Mar 2, 2011 at 16:35
  • 1
    You're welcome. Getting answers for people is what I'm here for. ♪
    – Grace Note StaffMod
    Mar 2, 2011 at 16:41
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    @Grace, really? I thought introducing people to the musical wonder of U+266A was what you were here for.
    – Pops
    Mar 2, 2011 at 16:45
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    wget -qO- http://stackauth.com/1.0/sites | gunzip | grep -oh \"htt.*\" | uniq > log.txt
    – Incognito
    Mar 2, 2011 at 19:42
  • Is i.stack.imgur.com non-specific enough to cover all likely cases of direct image uploading? (Joel's answer above just mentions imgur.)
    – mwfearnley
    May 28, 2016 at 16:52
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    comma seperated list of all the main domains listed above: askubuntu.com, mathoverflow.net, blogoverflow.com, serverfault.com, stackoverflow.com, stackexchange.com, stackapps.com, stackmod.blog, stackoverflow.blog, stackoverflowbusiness.com, superuser.com, tex-talk.net, thesffblog.com
    – DFSFOT
    Apr 29, 2021 at 20:55
  • It may also be worth mentioning stackoverflow.co (which is the domain that the about-the-company pages moved to). There's also stackoverflowsolutions.com, which contains guidance on the company's paid products: Teams, Collectives, Advertising, and Employer Branding. (Some folks may also have received support emails from/linking to support.stackenterprise.co?) That said, I'm not sure where/how/whether that info belongs in this post, since they're not SE site domains specifically, and aren't needed to use our Q&A sites.
    – V2Blast StaffMod
    May 24 at 17:24
  • (Oh, and we also send emails related to the Q&A sites from a stackoverflow.email domain; see this MSO post for details.)
    – V2Blast StaffMod
    May 24 at 17:30

*.sstatic.net has all our static files. This is pretty much required to use the sites.

ajax.googleapis.com has JavaScript that helps the site function as expected. Pretty much required.

stackauth.com is needed for global login. Optional, but convenient if you're active on several Stack Exchange sites.

*.gravatar.com has the little icons next to people's names. Optional, but nice.

imgur.com hosts pictures that some users upload.

The other dependencies (*.quantserve.com, *.google-analytics.com) are used for our own analytics, letting us know how many visitors we get. Those are optional and the site works fine without them.

  • How will this change if a CDN is implemented?
    – nhinkle
    May 22, 2011 at 8:25
  • @nhinkle: It won't -- we're using a subdomain of sstatic.net, so "*.sstatic.net" covers that.
    – balpha Staff
    May 22, 2011 at 9:00
  • Good to know @balpha, thanks for the info.
    – nhinkle
    May 22, 2011 at 9:17
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    I know that Joel is badass and all, but how on earth did he answer a question that was asked in 2011, back in 2010 without breaking the laws of physics? Jun 20, 2013 at 10:20
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    @OctavianDamiean - it was merged - What websites support the Stack Overflow community?
    – ChrisF Mod
    Jul 27, 2013 at 18:25

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