That means all LAN IP address of the machine in your area.
For example, one of your tomcat configuration file, if the listening IP address 0.0.0.0 it means you set this tomcat server listens on all IP addresses of your local machine, can be accessed through any IP address to.
If you have a local IP address 192.168.1.10, 172.16.2.10, then visit this tomcat you can http://192.168.1.10 : 8080 / http://172.16.2.10 : 8080 / can access
If your monitor is set up address 192.168.1.10, it will not be able http://172.16.2.10 : 8080 / access