Routing table

What it does: shows THIS machine's IP routing table — the rules the OS uses to decide where each packet goes. Each row is a destination (a network or host), the gateway / next-hop it's sent to, the interface it leaves by, and a metric (lower wins when two routes overlap). The "default" route is the catch-all for anything not matched by a more specific row — normally your gateway to the internet.

What you need: nothing — press Refresh. It reads the live table (Windows: route print; Linux: /proc/net/route and /proc/net/ipv6_route). No admin rights needed, and nothing leaves your machine.

Safe to run: yes — it only reads.

What to expect / reading results: look at the default route first — is its gateway the one you expect? A surprise default (or a second one with a lower metric) is a classic cause of traffic "going the wrong way" — e.g. a VPN or a second NIC quietly taking over. A specific route (like 10.20.0.0/16 via a particular gateway) shows how a subnet is reached; a MISSING route explains why a destination is unreachable even though the link is up.