WhatRoute is designed to find the names of all the routers an IP packet passes through on its way from your Macintosh to a destination host.
WhatRoute works by measuring the round-trip time from your Mac to the router thus enabling you to determine slow links or breakages in the Internet. By doing this, WhatRoute can find dead links, such as routers that don't respond.
One of the most useful features of WhatRoute is a map which allows users to see precisely where blockages or problems are. The overall interface however is very dated and doesn't look great in OS X. It is user friendly though - there's no need to know the IP address of the target you want to inspect - just type in the domain name (such as softonic.com) to test connections.
WhatRoute is a solid tool for inspecting links and net blockages.