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Every post filed under “networking”, newest first.
3 posts.
Pushkar Kumar 6 min read
An IPv6 subnet calculator explained: why classic ipcalc is IPv4-only, how sipcalc adds IPv6 support, and the exact math behind splitting a /48 into /64s.
Pushkar Kumar 8 min read
The three RFC 1918 private IP ranges, why 172.16.0.0/12 catches people out, the addresses that look private but aren't, and how to pick a range that won't collide.
Pushkar Kumar 8 min read
How to read CIDR notation: what the number after the slash means, a prefix-to-netmask table from /8 to /32, and real examples from VPCs, firewalls and Kubernetes.