4 ms·

Well you always have Layer 1/2 data. DSL modems, cable, LTE ... will show diagnostic information on which you can estimate some bandwidth, more or less.

• wtallis 9y ago
  That doesn't help you figure out if there's congestion two hops away in the ISPs network due to them oversubscribing their backhaul links.
  • gsich 9y ago
    True. That's what speedtests are for. Ideally you have your own server, so that you can factor out at least one third party.