Glossary term
What is CIDR (Classless Inter-Domain Routing)?
CIDR stands for Classless Inter-Domain Routing.
In DevOps
The /16, /24, /32 notation for a range of IP addresses. Smaller number = bigger range. /32 is exactly one address.
Learn it properly · DevOpsLesson 2: Networking Basics: IP, Ports, TCP/UDP and FirewallsHow a browser request actually finds and reaches your server. The layer Vercel hides completely, and the one you must understand before EC2 makes any sense.In System Design
A short way to write a range of IP addresses. Example: 10.0.0.0/16 means all addresses from 10.0.0.0 to 10.0.255.255.
Learn it properly · System DesignLesson 1: What Happens When You Type a URL and Press Enter?The one second between pressing Enter and seeing a page hides a DNS lookup, a trip through a dozen routers, two handshakes and a server doing real work. Every later lesson zooms into one part of that journey.In Networking for Developers
Writing a block of addresses as address/prefix, like 192.168.10.0/26, where the number counts the network bits.
Learn it properly · Networking for DevelopersLesson 1: IP Addresses, Subnets, NAT and RoutingIPv4 and IPv6, CIDR notation worked by hand, private ranges, NAT, routing tables and how a packet finds its way.