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Spark NZ
Like most Internet Providers in NZ Spark blocks certain TCP or UDP ports by default for our customers. These are generally either used by insecure protocols that you should never use over the internet, or ones commonly used for Denial of Service or spamming. We are about to start rolling out blocking of an additional two ports starting 22 June 2026.
We will be blocking UDP port 1900 used for SSDP (Simple Service Discovery Protocol) which is used for Universal Plug and Play (UPnP).
We will also be blocking UDP port 123 used for Network Time Protocol (NTP).
Both of these ports are being blocked in the incoming direction only - so your devices will still be able to contact NTP servers of your choice. It would only block you if you were attempting to run your own NTP server.
For a full list of ports blocked please prefer to this site:
Service restrictions | Spark NZ
As usual you can easily opt out of this blocking (which opts you out of all port filtering) by using the following link. If you already opted out these changes won't apply to you:
