Can two applications listen to the same port?

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Can two applications on the same machine bind to the same port and IP address? Taking it a step further, can one app listen to requests coming from a certain IP and the other to another remote IP? I know I can have one application that starts off two threads (or forks) to have similar behavior, but can two applications that have nothing in common do the same?

port udp communication tcp sockets
17 Answers

Just to share what @jnewton mentioned. I started an nginx and an embedded tomcat process on my mac. I can see both process runninng at 8080. 

LT<XXXX>-MAC:~ b0<XXX>$ sudo netstat -anp tcp | grep LISTEN
tcp46      0      0  *.8080                 *.*                    LISTEN     
tcp4       0      0  *.8080                 *.*                    LISTEN
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