How to discover web servers on a local network?

java sockets discovery
Stefan Kendall picture Stefan Kendall · Apr 27, 2010 · Viewed 11.9k times · Source

Suppose I'm running several servers serving basic requests on my local network (say a home network, where all machines generally have an IP in the form K.K.K.x, where x is variable). Is there an easy way to discover all such servers? I would need to find each IP on the network running a particular java server application.

Answer

Trey Hunner picture Trey Hunner · Apr 27, 2010

Are you looking for a solution within your Java application? If you are simply looking for a one-time solution, nmap should work.

If your local network is of the form 192.*.*.* try this (I added sudo because it must be run as root):

sudo nmap -vv -sS -O -n "192.168.1.1/24"

Related questions

What's causing my java.net.SocketException: Connection reset?

We are seeing frequent but intermittent java.net.SocketException: Connection reset errors in our logs. We are unsure as to where the Connection reset error is actually coming from, and how to go about debugging. The issue appears to be …

Read More
java.net.SocketException: Connection reset

I am getting the following error trying to read from a socket. I'm doing a readInt() on that InputStream, and I am getting this error. Perusing the documentation this suggests that the client part of the connection closed the connection. …

Read More
Getting the IP address of the current machine using Java

I am trying to develop a system where there are different nodes that are run on different system or on different ports on the same system. Now all the nodes create a Socket with a target IP as the IP …

Read More