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Network Tools

Diagnose connectivity end to end: verify a host answers, measure round-trip latency, follow the path packets take across autonomous systems and confirm that a service is listening where you expect it.

How these tools run · Probes run from the NetworkUtils.org server using Node.js standard networking libraries. Ping attempts an ICMP echo via the system ping utility and falls back to a TCP connect probe on port 80 when ICMP is unavailable in the probe environment; traceroute uses the system traceroute utility; the Port Check and TCP Handshake tools open real TCP connections to the specified port; the MTU Probe sends progressively larger packets with the Don’t-Fragment flag set.

Tools in this category

Ping

ICMP echo test with round-trip latency and packet loss.

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Traceroute

Hop-by-hop path with per-hop latency and ASN owner.

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Port Check

TCP connect test against common or custom ports.

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TCP Handshake

Connection setup timing split by SYN, ACK and first byte.

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MTU Probe

Find the largest packet size that survives the path.

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Related guides

In-depth articles that cover network tools in more detail.

Network

What Traceroute Actually Shows You (and What It Does Not)

Traceroute is the first tool everyone reaches for and one of the most misread. Here is how the technique works, why hops disappear, and when the output is lying to you.

Network

PING — A Definitive Guide

A protocol-first reference to ping: how ICMP echo works, what the NetworkUtils.org tool actually measures, and how to read Windows, Linux, and macOS output without overclaiming.

Editorial note

Maintained by the networkutils.org editorial team. Tool descriptions and methodology on this page reflect the live implementation in the NetworkUtils.org backend. Last updated September 2026.