The Sky Networks - CIDR CIDR (Classless Inter-Domain Routing) notation rather than the common subnet mask 255.x.x.x when configuring addresses and networks. Refer to the CIDR Subnet Table to find the CIDR
CIDR notation - ICTShore.com
CIDR Notation - YouTube
What is CIDR? – BigDataEnthusiast
What Is CIDR (Classless Inter-Domain Routing)? - KeyCDN Support