Example ldapsearch

ldapsearch -P 3 -H "ldap://ldap_server:389" -D "cn=exampleuser,CN=Users,DC=example,DC=com" -W -b "CN=Users,DC=example,DC=com" -s "sub" -z 0 -l 0 -a "never" "(&(objectClass=user)(sAMAccountName=exampleuser@example.com))"

-D "cn=exampleuser,CN=Users,DC=example,DC=com" -- Binding user
"(&(objectClass=user)(sAMAccountName=exampleuser@example.com))" -- user to lookup
-b "CN=Users,DC=example,DC=com" -- base dn

Search AD

ldapsearch -H ldaps://win2k19.ad.lab.wafflelab.online -x -W -D dan_su@ad.lab.wafflelab.online -b DC=ad,DC=lab,DC=wafflelab,DC=online  "(sAMAccountName=USERNAME)"

dn for a regular user in AD

dn: CN=test mcmuffin,CN=Users,DC=ad,DC=lab,DC=wafflelab,DC=online

Another search in AD

ldapsearch -H ldap://ad.wafflelab.online -x -W -D "user@wafflelab.online" -b "DC=wafflelab,DC=online"