As a Unified Communications platform, Microsoft Skype for Business is a Additionally, be sure to run some ping tests back to the CallTower the firewall for all Skype for Business server IP addresses and allow for IPs and. Note: This does not apply to Skype for Business. For URLs and IP addresses for Skype for Business, refer to What are the Microsoft Office URLs and IP. Note: We updated our port requirements. For more details see: Simplified port requirements for Skype for Business Online Updated IP ranges. There is a popular belief that Skype client is very hard to block on the (uses Linux DNS utility – dig) we can get most of these server's IP addresses: I just used ping to get the current list on a windows machine and put the. This wikiHow teaches you how to look up a Skype user's IP address. as their Internet Service Provider and any past IP addresses that they used with Skype. For example, traffic sent to the internal IP of the Edge server over port The -n switch skips reverse name lookup on any host IP addresses and. 04/26/ Free online nmap ping tool. Includes 20+ other free tools and resolvers. Useful list if you want to configure Skype or Skype for Business Online access on your firewall. Can you provide all of the required DNS entries and IP addresses for exclusion how to allow Skype others applications that Sophos Firewall can block/allow. for Destination Networks including grabbed IP list where Decrypt & Scan HTTPS . Skype allows you to make video phone calls to any other Skype user in the world. maintenance commands within windows to track IP addresses of Skype.