![Subnet Mask and CIDR: How many valid hosts can be used on a specific subnet (Classless Addressing)? – Help Center | EnGenius Subnet Mask and CIDR: How many valid hosts can be used on a specific subnet (Classless Addressing)? – Help Center | EnGenius](https://helpcenter.engeniustech.com/hc/en-us/article_attachments/115005581307/IP_Subnetting.png)
Subnet Mask and CIDR: How many valid hosts can be used on a specific subnet (Classless Addressing)? – Help Center | EnGenius
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
![The TCP/IP Guide - IP "Supernetting": Classless Inter-Domain Routing (CIDR) Hierarchical Addressing and Notation The TCP/IP Guide - IP "Supernetting": Classless Inter-Domain Routing (CIDR) Hierarchical Addressing and Notation](http://www.tcpipguide.com/free/diagrams/ipcidr.png)
The TCP/IP Guide - IP "Supernetting": Classless Inter-Domain Routing (CIDR) Hierarchical Addressing and Notation
![Glenn Axelrod ,M.S. on Twitter: "CIDR notation is a compact representation of an #IP address and its associated #routing prefix. Its goal was to reduce the expansion of routing tables on routers Glenn Axelrod ,M.S. on Twitter: "CIDR notation is a compact representation of an #IP address and its associated #routing prefix. Its goal was to reduce the expansion of routing tables on routers](https://pbs.twimg.com/media/EDv2CYPUwAAjvqr.jpg)