How many bindings will IIS 7.5 support on one web site ?

To make sure my question is understand correctly.

  • I know i can put multiple website on the same server.
  • I know i can put multiple website on the same IP
  • I know i can put multiple binding on the same website

My questions is, it's there a limit of binding on the same web site.

Supose i get something like

  • www.serverfault.com
  • serverfault.com
  • m.serverfault.com
  • a.serverfault.com
  • b.serverfault.com etc..

On the same web site binding ....


In theory the maximum number of bindings per site is 65535 (the total number of ports available, period), minus, of course, any ports otherwise in use on the system (i.e. 25, 110, 3389, etc).

Now, what you'd need with 65k ports bound to the same site is beyond me. Mailq's reference to the How Many Sites question may be more what you want to know.

  • 2
    @Driftpesant, why it's limited by the number of port ? It's suppose to be only a validation on the header of the HTTP request no ? – Cédric Boivin Dec 16 '11 at 14:46
  • In this case @CédricBoivin is right. Binding in IIS is not what you normally expect by the word "binding". MS is stupid in this case. – mailq Dec 16 '11 at 18:32
  • Actually no - binding in IIS means exactly this. It is just - due to http - not as primitive / limited as a pure port binding. – TomTom Nov 26 '13 at 18:28

I'd say that the limit to bindings should practically be dependant on how large applicationHost.config can be: MS reference

  • This is only true for IIS6 and older versions (in which there was an actual limit of 1024 endpoints bound). In IIS 7.0 and above, site bindings are stored in applicationHost.config – Mathias R. Jessen Jan 31 '14 at 15:41

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.