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Networking

IPv4

Name Old Name Largest CIDR Block / Subnet mask
24Bit “Class A” 10.0.0.0/8, 255.0.0.0
20Bit “Class B” 172.16.0.0/12, 255.240.0.0
16Bit “Class C” 192.168.0.0/16, 255.255.0.0

Reserved IPs:

  1. 127.0.0.0/8 → defines as localhost
  2. 100.64.0.0/10 (255.192.0.0) → carrier grade NAT
  3. 0.0.0.0/8 → undefined
  4. 224.0.0.0 to 239.255.255.255→ multicast

IPv6

fe80::/10 link local
fc00::/7 unique local