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Weird IP Addresses

Curious cases and reserved ranges that might surprise you.

Published: Sep 02, 2025•1 min read

From 0.0.0.0 to 255.255.255.255, and loopbacks like 127.0.0.1, IP has plenty of interesting edge cases and reserved ranges.

Examples

  • 0.0.0.0 — wildcard
  • 127.0.0.1 — loopback
  • 169.254.0.0/16 — APIPA (link-local)
  • 224.0.0.0/4 — multicast