> For the complete documentation index, see [llms.txt](https://mudassirs46.gitbook.io/network-fundamentals/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mudassirs46.gitbook.io/network-fundamentals/ipv4-address-parts.md). # IPv4 Address parts [**IPv4**](https://app.gitbook.com/@mudassirs46/s/network-fundamentals/~/drafts/-MRZ8l67L5MHnaQIEh9W/ipv4) **Address is divided into 2 parts:** * 1. **Network Port** 2. **Host Portion** #### 1. Network Portion (NID): * Network Portion also called Network ID (NID) is used to identify a specific Network. * Upon receiving the packet, a Router looks at the DIP & matches the Network Address stored in its Routing Table. * The Real-life equivalent of NID is a Pin code of an area where only your area code is mentioned but not your read house address #### Host Portion (HID): * Host Portion also called Host ID (HID) is used to identify a specific endpoint (devices) on a Network. * E.g. A PC, SmartPhone, Servers, Printers, etc. * The Real-life equivalent of HID is your House Room Number where your actual House Address is mentioned but not your Pin code. ## Reference: *