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53: Yes: Domain Name System (DNS) 54: Assigned: Xerox Network Systems (XNS) Clearinghouse (Name Server). Despite this port being assigned by IANA, the service is meant to work on SPP (ancestor of IPX/SPX), instead of TCP/IP. 55: Assigned: isi-gl (ISI Graphics Language) 56: Assigned: Xerox Network Systems (XNS) Authentication Protocol.
The client may rely on the DoT server using traditional (port 53 or 853) queries to finally reach authoritative servers. Thus, DoT does not qualify as an end-to-end encrypted protocol, only hop-to-hop encrypted and only if DNS over TLS is used consistently. Alternatives
Installing a DoH proxy on the name server in the local network: In this scenario client systems continue to use traditional (port 53 or 853) DNS to query the name server in the local network, which will then gather the necessary replies via DoH by reaching DoH-servers in the Internet. This method is transparent to the end user.
Amazon Route 53 ( Route 53) is a scalable and highly available Domain Name System (DNS) service. Released on 5 December 2010 (13 years ago), [1] it is part of Amazon.com 's cloud computing platform, Amazon Web Services (AWS). The name is a possible reference to U.S. Routes, [2] and "53" is a reference to the TCP/UDP port 53, where DNS server ...
DNS over UDP/TCP/53 (Do53) UDP reserves port number 53 for servers listening to queries. Such queries consist of a clear-text request sent in a single UDP packet from the client, responded to with a clear-text reply sent in a single UDP packet from the server.
Using a firewall to disable DNS on whole device (usually outgoing connections UDP and less commonly TCP port 53), or setting dns servers to non-existing ones like local 127.0.0.1 or 0.0.0.0 (via command line or 3rd party app if not possible via OS GUI interface). This requires alternate ways of resolving domains like the above-mentioned ones ...
DNS hijacking, DNS poisoning, or DNS redirection is the practice of subverting the resolution of Domain Name System (DNS) queries. This can be achieved by malware that overrides a computer's TCP/IP configuration to point at a rogue DNS server under the control of an attacker, or through modifying the behaviour of a trusted DNS server so that it does not comply with internet standards.
While this does create apex DNS records of type A and MX, they do not qualify as a dotless domain, as the records should not point to real servers. For instance, the A record contains the IP 127.0.53.53, a loopback address (see IPv4 ยง Addressing), picked as a mnemonic to indicate a DNS-related problem, as DNS uses port 53. Pseudo-domains
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