IP Private or IP Local Standard RFC 1918 - Mikrotik Script RouterOS

Address Allocation for Private Internets
This document specifies an Internet Best Current Practices for the
Internet Community, and requests discussion and suggestions for
improvements.  Distribution of this memo is unlimited.

read more > Address Allocation for Private Internet

/ip firewall address-list
add address=0.0.0.0/8 list=LOCAL-IP
add address=10.0.0.0/8 list=LOCAL-IP
add address=100.64.0.0/10 list=LOCAL-IP
add address=127.0.0.0/8 list=LOCAL-IP
add address=169.254.0.0/16 list=LOCAL-IP
add address=172.16.0.0/12 list=LOCAL-IP
add address=192.0.0.0/24 list=LOCAL-IP
add address=192.0.2.0/24 list=LOCAL-IP
add address=192.168.0.0/16 list=LOCAL-IP
add address=198.18.0.0/15 list=LOCAL-IP
add address=198.51.100.0/24 list=LOCAL-IP
add address=203.0.113.0/24 list=LOCAL-IP
add address=224.0.0.0/4 list=LOCAL-IP
add address=240.0.0.0/4 list=LOCAL-IP
Credit: https://tools.ietf.org/html/rfc1918