Understanding IP Addressing and CIDR Charts — RIPE Network Coordination Centre
A host has the IP 192.168.7.26 and a subnet mask of 255.255.0.192. What network does this hosts address belong to? - Quora
IP Subnet Calculator
Understanding IP Addressing and CIDR Charts — RIPE Network Coordination Centre
Subnetting and Subnet Masks Explained
networking - How do I get a /23 subnet mask from 172.16.0.0 /21 network address? - Super User
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
tcpip - How to understand the "A subnet Example"? - Server Fault
Network Subnetting Reference Sheet
Subnetwork - Wikiwand
Subnet Cheat Sheet – 24 Subnet Mask, 30, 26, 27, 29, and other IP Address CIDR Network References