default Oracle database web console URL is https://localhost:1158/em

If you installed Oracle (standard version) locally, the default port and URL for the web console is: https://localhost:1158/em

Remember you need to start the db console servervice

On Windows: default service name is "OracleDBConsoleorcl"
On Linux: emctl start dbconsole , my path is here "/opt/app/oracle/product/11.2.0/dbhome_1/bin/emctl", yours maybe different.

BTW, default Oracle XE web console URL is "http://127.0.0.1:8080/apex"