Why is the URL different?

  • Because they are different sites? The URL is different for each site in the network too.
    – Oded
    Commented Nov 2, 2017 at 11:52
  • @Oded pretty sure OP means the different ID. Commented Nov 2, 2017 at 11:54
  • Also my point. OP has accounts on a bunch of Stack Exchange sites - the ID is different on each an every one of them.
    – Oded
    Commented Nov 2, 2017 at 11:55

1 Answer 1


Each site/community in Stack Exchange network has its own set of users.

When you first join a site, you are assigned a unique ID on that site. If you later join more sites with the same credentials/account then a new profile is created on each site, with a new ID, and is just associated with your other accounts. The ID on each site will still be different.

As for https://stackexchange.com it's not a Q&A site, but rather the "portal", and contains the Network Profile, which has yet another unique ID for each user, assigned once the network profile is created. The network profile is created upon initial signup for the first time, on any SE site.

  • @Desire you mean unregistered users also have to log in? Oded said signing up is the trigger to create network profile, hence my edit. Commented Nov 2, 2017 at 19:48
  • 2
    "Unregistered" means they signed up by providing a name and email address, but not (yet) an OpenID. They can't log in if they get logged out, but they did "sign up".
    – user315433
    Commented Nov 2, 2017 at 21:03

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