What port is used when a system talk to AD

I'm looking for what port is used when a system would query AD.  Need to for a network device that needs to query AD.
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Mike KlineConnect With a Mentor Commented:
Port 389 (LDAP)and port 3268 for GC searches more info in the KB below


If you are using secure LDAP  it uses port 636 and 3269 for secure GC searches


Spyder2010Connect With a Mentor Commented:
If you are querying AD using the LDAP protocol, you would use either:

tcp 389 (unsecure)
tcp 636 (SSL)
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