Here are the addresses and ports needed to be whitelisted on your firewall in order to work with EurekaWorld.
EurekaWorld Grid Connectivity
IP addresses:
52.18.185.60
52.17.9.84
52.18.231.125
52.48.116.55
54.77.78.249
Ports:
8000-8005 (TCP, UDP)
9000-9200 (TCP, UDP)
Voice Capabilities
IP address:
52.215.31.172
Ports:
80 (TCP)
443 (TCP)
1720 (TCP)
5060 (TCP, UDP)
5080 (TCP, UDP)
8080 (TCP)
8443 (TCP)
16384 - 32768 (UDP)