Module 1 : IP Address ?

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It’s nothing but a unique Identity of a Device on a Network
Every device that connects to a network (laptop, phone, server) needs an IP address.

Types of IPs: Public and Private

1️ Public IP

  • Assigned by ISP (Internet Service Provider)
  • Unique globally
  • Can be accessed from anywhere on the internet
  • Used by ISPs(Jio, airtel, any cellular companies that provides) to give internet access to your home or office

2 Private IP

  • Used inside a local network (home, office, cloud VPC)
  • Cannot be accessed directly from the internet
  • ISPs assign you a public IP, but inside your network, your devices have private IPs
  • Solves the shortage of public IPs

Private IP Ranges (RFC1918) 

Range                                        CIDR    Notes
0.0.0.0        – 10.255.255.255        /8      Large networks
72.16.0.0    – 172.31.255.255        /12     Medium networks
92.168.0.0  – 192.168.255.255      /16     Small/home networks

Check points

  • If your IP falls in one of these ranges → private; otherwise → public
  • Public IP → internet sees it
  • Private IP → used inside your network, translated by NAT at the router

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