Public IP

  • Any IP other than Private IP

Private IP

  • Private IP does not change if EC2 Instance is restarted (stop and then start)

  • Big Network Range 10.0.0.0 - 10.255.255.255 and CIDR (10.0.0.0/8)

  • AWS Default Range 172.16.0.0 - 172.31.255.255 and CIDR (172.16.0.0/12)
  • Home Network Range 192.168.0.0 - 192.168.255.255 and CIDR (192.168.0.0/16)

Elastic IP

  • Does not change if EC2 Instance is restarted (stop and then start) or terminated
  • Max 5 Elastic IP can be used in one region
  • We can bring our own IP as Elastic IP
  • Elastic IP is charge, even if it is not being used