* man-da: 82.195.75.64/26
* sil: 86.59.118.144/28
* ubcece: 206.12.19.0/24
+ * ubc: 209.87.16.0/24
* bytemark: 2001:41c8:1000::/48
* grnet: 2001:648:2ffc:deb::/64
* man-da: 2001:41b8:202:deb::/64
* sil: 2001:858:2:2::/64
* ubcece: 2607:f8f0:610:4000::/64
+ * ubc: 2607:F8F0:614:1::/64
* allow all return traffic on tcp/udp/etc.
Extra ports might be required for specific services.