What CIDR is, why it replaced IP classes, and how to read network prefixes

Variable Length Subnet Masking - when to use it and common pitfalls

Combine multiple networks into single routes for efficient routing

Global unicast, ULA, link-local, multicast, and special IPv6 addresses

Quick reference for /128, /127, /64, /60, /56, /48, /32 with typical uses

IPv4-mapped addresses, 6to4, Teredo, and transition mechanisms

SLAAC privacy extensions: temporary vs stable interface identifiers

Quick reference for common subnet sizes and host counts

Legacy network classes and their modern CIDR equivalents

Comprehensive list of reserved and special-use IP address ranges

Reserved IPv4 ranges including private networks, CGNAT, and test blocks

Understanding private/public IPs, NAT implications, and identification

CGNAT (100.64.0.0/10), how to identify it, and service impacts

IPv4 APIPA (169.254/16) and IPv6 link-local (fe80::/10) at a glance

Multicast scopes, well-known groups, and local subnet limitations

How in-addr.arpa and ip6.arpa work with examples for IPv4 and IPv6

Minimal reverse DNS zones needed to delegate IPv4 and IPv6 CIDR blocks

Practical guide to ICMP message types for network troubleshooting

Side-by-side comparison of IPv4 ARP and IPv6 Neighbor Discovery

Autonomous Systems, BGP basics, and how IP addresses map to ASNs

Quick reference for frequently used port numbers and services

Wildcard masks vs netmasks, quick conversions and ACL examples

MTU and MSS values for Ethernet, PPPoE, VPN, and overhead calculations