Need more info about version of Apache on Ubuntu

Hi I am running a Ubuntu 16.04lts webserver and need Apache
2.4.18-2ubuntu4.2 or newer.

When I run "apache2 -v" it returns:

Server version: Apache/2.4.18 (Ubuntu)
Server built: 2017-09-18T15:09:02

Since Ubuntu does back porting I need more info to determine the exact
version such as is it 2.4.18-2ubuntu4.2 or some other version.

How can I get this detail?

Thanks in advance for your help!!

Keith---------------------------------------------------
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