If you are trying to see if connectivity works on DNS request (normally uses UDP/53), then the answer is no, telnet on port 53 will not work. If you are trying to test DNS resolution/request, then just use "nslookup" from command prompt, then specify the dns server: server , then test the resolution: cisco.com. Example from DOS prompt:
TCP and UDP port numbers - complete list Jan 12, 2012 Free VPN UDP Server | TcpVPN.com VPN or Virtual Private Network is a connection between a network with other networks in private over the public network. or in other words to create a separate WAN actual both physically and geographically so logically form a single netwok, packet data flowing between the site and from remote access to users who do will have encryption and authentication to ensure the security, integrity and
Nov 20, 2017
248 rows Port 53 (tcp/udp) :: SpeedGuide
Re-read my first reply - EVERYBODY gets port scans, EVERYBODY- you probably weren't aware of them before, you can't stop them. Switching the ISP won't help, switching the router won't help, it's part of the reason people use firewalls - the firewall stops the scan from reaching the computer, but the scans will still hit the firewall, they don't go away.
DNS servers listen on port 53 for queries from DNS clients. Incoming UDP packets carry queries which expect a short reply, and TCP connections carrying queries requiring longer and … security - How to verify that a UDP port is open