How to find all the snmp enabled devices in my network?

Solution 1:

You can use Nmap's snmp-brute something like

nmap -sU -p161 --script snmp-brute --script-args snmplist=community.lst 192.168.1.0/24

Solution 2:

Many monitoring applications will include a network discovery tool which can query snmp on all devices it discovers. Some will even allow you to enter multiple SNMP community strings and it will try each of them.