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What is the port number of Dns?
The DNS port is 53 UDP for DNS resolution.

Generally, both domain name providers and dns servers have udp53 ports. Win comes with dns, which is also udp53.winmydns intelligent parsing software. It builds a dns server, provides domain name resolution, and also makes udp53 port. If the port is not open or occupied by other content, it will lead to abnormal domain name resolution.

1, DNS (Domain Name System), as a distributed database on the World Wide Web, maps domain names and IP addresses, so that users can access the Internet more conveniently without having to remember IP number strings that can be directly read by machines.

2. The process of obtaining the IP address corresponding to the domain name through the domain name is called domain name resolution (or hostname resolution). DNS protocol runs on top of UDP protocol, using port number 53. In the RFC document, RFC 2 18 1 has the specification of DNS, RFC 2 136 describes the dynamic update of DNS, and RFC 2308 describes the reverse cache of DNS queries.

3. Each IP address can have a host name, which consists of one or more strings separated by decimal points. With the host name, you don't have to memorize the IP address of each IP device, just remember the relatively intuitive and meaningful host name. This is the function of DNS protocol.

References:

Baidu encyclopedia: DNS