Bit Field Guide

Code

Network 1 octet ICMP echo message unverified

Narrows the type. Zero for echo; for Destination Unreachable it says whether the network, host, protocol or port was the problem.

Where it sits

ICMP Message > Code

Open in the explorer — ICMP echo over IPv4, in a QoS Data frame

Accuracy

Clause: RFC 792
Verified: Not verified against the standard. Treat this as a claim, not a fact.