Under my DNS settings, Arboristal.com is set to go to our web host who is currently hosting our website. I have three servers running at my house all running under one public IP address. ( I also have three subdomains of Arboristal.com pointing towards my IP address. Each of the three servers run on their own ports (25565, 25566

Everyone knows that DNS servers use UDP port 53 for queries, right? Well something that I recently learned was that DNS servers also use TCP port 53 to do zone transfers (axfrs). Make sure to open that port up in your firewall if you are allowing zone transfers from your DNS server. Knowing that sooner could have saved me a lot of time! Is DNS TCP or UDP Port 53? | Infoblox DNS Security Center FAQ The answer is DNS is mostly UDP Port 53, but as time progresses, DNS will rely on TCP Port 53 more heavily. DNS has always been designed to use both UDP and TCP port 53 from the start 1 , with UDP being the default, and fall back to using TCP when it is unable to communicate on UDP, typically when the packet size is too large to push through in a single UDP packet. Port Scanner - Find Your Active Network Ports - DNS Checker Port Scanner Port Scanner Scans the ports against an IP address or a domain. A port in networking is a term used to identify the service to which an incoming packet is to be forwarded. Most commonly used port types are TCP and UDP Ports.

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