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Chrome Connectivity Diagnostics - By Google - Runs Offline
Download from Chrome Web Store:

Chrome Connectivity Diagnostics is a fast and simple network testing and troubleshooting tool for Chrome and Chrome OS.

The tool tests a computer's network connection for common issues, port blocking, and network latency by establishing connections to network and Internet services via UDP, TCP, HTTP and HTTPS.

The diagnostic tests include:​
    • Local network connection availability
    • Wifi network signal strength (Chrome OS only)
    • Default gateway is reachable (Chrome OS only)
    • DNS server availability and latency
    • DNS cache poisoning/spoofing
    • Internet traffic blocks by a HTTP captive portal or firewalls
    • Network performance and latency to Google websites
    • Google Hangouts service availability
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