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Traceroute Online

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Examples #

Try a few example inputs:
  • [TRY]
  • [TRY] + don't resolve the address
  • [TRY], maximum hops: 5

See Also #

Description #

Traceroute Online is a tool that shows you the network path between two network nodes (also called "hops"). It is commonly used for diagnostics of network problems and it is useful for getting information about the network topology. A round-trip time is measured and reported for each node on the path from the source machine to the target machine.

Traceroute Online works over the Internet Control Message Protocol (ICMP) by sending ICMP Echo Request packets. In general, however, traceroute command can also be implemented using other protocols such as User Datagram Protocol. Traceroute works by increasing the Time To Live (TTL) value of packets it sends. The first set of packets is sent with TTL set to 1. Each router on the network path decreases the TTL value of each packet by 1 before it is sent to the next hop. When the TTL value of the packet hits zero the packet is no longer forwarded and the source machine is informed about this with ICMP Time Exceeded message. It is thus expected that the first router in the network path will send Time Exceeded message when it receives the first set of packets. The second set of packets is sent with TTL set to 2 and so they are stopped by the second router in the network path etc. When the TTL value is big enough to reach the target host, it replies to the request and the whole process ends. Traceroute Online sends three packets with the same TTL value before increasing it.

On the output Traceroute Online lists all the intermediate routers a network packet must pass through to reach the target address. The round-trip time statistics are also displayed for each node on the network path.

When a network node does not respond to Traceroute Online packets it might be a sign of its network hardware failure, incorrect router or firewall configuration, as well as a result of intentional configuration of the target host's firewall not to response to Echo Request messages. In case of machines connected to the Internet such a policy that forbids to reply to traceroute packets is not rare. On the other hand, in the local network environments the responsiveness is usually required.

Usage #

To use Traceroute Online you just need to specify the target host name or IP address in the Host / IP address field. By default the target IP address is set to your IP address, which means that our server will try to find a network path to your machine. Then click the "Trace!" button to start. When you specify the host name, it will be translated to IP address before the first packets are sent.

You can also set some other parameters of the traceroute command:

  • Resolve addresses – Enables resolving IP addresses to hostnames.
  • Maximum hops – The maximum number of hops on the path. If the network path to the target host is longer than this limit, the result will contain information about the first specified number of network nodes only.
  • Timeout – Specifies the number of milliseconds to wait for each reply.

Limits #

  • Host / IP address – You can use any valid host name or IP address except for localhost and special-use addresses. Your IP is
  • Maximum hops – An integer between 1 and 255.
  • Timeout – An integer between 1 and 30000 milliseconds.

Other Limits #

The maximal permitted duration of traceroute is 900 seconds. Since there are always three packets with the same TTL value sent, this limit means that 3*Timeout*Maximum hops should not exceed 900000.