The IPv4 header is variable in size due to the optional 14th field (Options). The IHL field contains the size of the IPv4 header; it has 4 bits that specify the number of 32-bit words in the header.

Jan 9, 2026 · IPv4 was the first widely deployed version of the Internet Protocol and was introduced for use in the ARPANET in 1983. An IPv4 address is a 32-bit numeric value, which is represented in …

Jul 22, 2025 · This tutorial explains the IPv4 header in detail. Learn what an IPv4 header is, how many fields an IPv4 header contains, what the meaning of each field is, and what the value is stored in …

The IPv4 header is a 20-60 byte structure that contains information fields about the packet at the beginning of every IPv4 packet. It acts like a shipping label, telling routers where the packet is …

Internet Protocol being a layer-3 protocol (OSI) takes data Segments from layer-4 (Transport) and divides it into packets. IP packet encapsulates data unit received from above layer and add to its own …

Jan 2, 2026 · The IPv4 datagram header is a structured part of every IPv4 packet that drives Internet communication. The header comes before the actual data payload and contains vital details like …

Apr 30, 2025 · The IPv4 header efficiently packs all the necessary routing and control information into a compact structure, typically 20 bytes long (without options). This design allows for fast processing by …

In this article, we will explain the header section of an IPv4 packet. The IPv4 header has a variable length of 20-60 bytes, depending on the IP options present.

Feb 28, 2025 · It contains vital information that helps routers and devices determine where the packet is coming from, where it’s going, and how to handle it. In this post, we’ll break down the structure of an …

Following image shows the structure and the fields of IPv4 header. " Version " is 4-bit field indicates which version of Internet Protocol (IP) is being used. Here we are discussing about IPv4. The binary …