mtr:tldr:21616

The command "mtr --aslookup ${hostname}" is used to perform an MTR (My Traceroute) network diagnostic measurement that includes an AS (Autonomous System) lookup for a specific hostname.

Here is the breakdown of the command components:

• "mtr" stands for My Traceroute. It is a command-line utility that combines the functions of the ping and traceroute commands to provide detailed network path analysis along with latency and packet loss information.
• "--aslookup" is an option/flag specific to the mtr command. By using this flag, you are requesting an additional step in the traceroute process to perform an Autonomous System (AS) lookup for each hop.
• "${hostname}" is a placeholder variable that should be replaced with the actual hostname you want to perform the MTR and AS lookup on. For example, if you want to measure the network path and AS information for the website "example.com", you would replace "${hostname}" with "example.com".

When executed, this command will run the MTR utility on the specified hostname. It will trace the network path, showing the successive hops from your local machine to the destination hostname. Additionally, it will perform an Autonomous System lookup for each hop, displaying the AS number and other relevant AS information associated with each router or network node along the path.