Which Internet protocol (IP) packet fragmentation header field specifies where the fragment belongs in the original datagram?

The Fragment Offset field in the Internet Protocol (IP) header is used to indicate the position or location of a fragment within the original datagram. When a packet is too large to be transmitted over a network, it is broken down into smaller fragments. Each of these fragments carries a portion of the data from the original packet, and the Fragment Offset field specifies the byte offset of the fragment from the start of the original data payload. This allows the receiving device to accurately reconstruct the entire datagram by correctly ordering the fragments based on their offsets.

The other fields serve different purposes, such as specifying the total length of the fragment, identifying the fragments that belong to a specific datagram, or indicating the type of fragment, none of which play a role in denoting the position of a fragment within the original datagram.