Challenge Mode
Network Doctor is an open-source terminal user interface for investigating network connectivity problems across interface, DNS, TCP, TLS, HTTP, proxy, and path-MTU layers. It also provides a containerized simulator and challenge mode for practicing diagnosis without affecting a real network.
Overview
11 featuresChallenge Mode is a CLI tools & terminal project. It focuses on diagnosing where and why a network connection fails across interface, DNS, TCP, TLS, HTTP, proxy, and MTU layers. Challenge Mode is an open-source project aimed at network engineers and developers. The project is open source (Apache-2.0). Challenge Mode is available on the web and the command line, and it can be self-hosted.
Hey Maikol builds and maintains Challenge Mode, and it first shipped in 2026. The project is developed in the open on GitHub with 295 stars and 797 commits in the last 90 days. Key capabilities include layered network checks, plain-English diagnosis, and DNS testing.
Summary written by a language model from the project’s public pages.
- Layered network checks
- Plain-English diagnosis
- DNS testing
- TCP testing
- TLS testing
- HTTP testing
- Proxy checks
- Path-MTU checks
- Network simulator
- Challenge mode
- Containerized install
Built with & integrations
Trust & compliance
Indexing history
1What PulseGate has recorded for this listing
- Indexed25 Aug · 02:56 UTCCan you diagnose a broken network faster than Network Doctor? verified via Hacker News firehose (Algolia)Source: Hacker News firehose (Algolia) · Open
Frequently asked questions about Challenge Mode
- What does Challenge Mode do?
- Challenge Mode focuses on diagnosing where and why a network connection fails across interface, DNS, TCP, TLS, HTTP, proxy, and MTU layers. It is catalogued under CLI tools & terminal on PulseGate.
- Who is Challenge Mode for?
- Challenge Mode is an open-source project built for network engineers and developers.
- Does Challenge Mode have a free plan?
- Yes — Challenge Mode is open source under the Apache-2.0 license and free to use.
- What platforms does Challenge Mode run on?
- Challenge Mode runs on the web and the command line. It can also be self-hosted.
- Is Challenge Mode still maintained?
- The GitHub repository shows 797 commits in the last 90 days.
- Who makes Challenge Mode?
- Challenge Mode is developed by Hey Maikol.
- When did Challenge Mode launch?
- Challenge Mode first shipped in 2026.
- Is Challenge Mode open source?
- Yes — Challenge Mode is open source under the Apache-2.0 license, developed on GitHub.
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