Hardware Address Length HLEN

Octets per hardware address. Six for Ethernet.

Reading a capture

This field and the next one determine the size of the four address fields below, which means the packet's own length is not knowable until they are read. The drawn widths here are the Ethernet-and-IPv4 instance, not the format.

Where it sits

ARP Packet > Hardware Address Length

• Open in the explorer — ARP request in a QoS Data frame

Accuracy

Clause

RFC 826

Verified

Not verified against the standard. Treat this as a claim, not a fact.