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32

Private Address Space

Reserved IP address ranges (like 10.0.0.0/8, 192.168.0.0/16) used inside organizations' networks, not routable on the public internet. Understanding them is foundational to interpreting internal versus external traffic.

Private address space (RFC 1918 ranges in IPv4 plus IPv6 equivalents) is reserved for use inside networks, not routed on the public internet, so many organizations reuse the same private IPs internally. For defenders, recognizing private versus public addresses is foundational: it distinguishes internal from external traffic, anchors NAT/PAT, and shapes investigations and segmentation. Misreading the distinction leads to wrong conclusions about where traffic came from or went.

Introduced in: Networking Foundations

Examples

  • Recognizing 10.0.0.0/8 as private address space inside the network.
  • Distinguishing internal private IPs from external public addresses in logs.
  • Translating private to public IPs at the perimeter via NAT.