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Top 10 UDP Ports Scanner Detail

You need to know which services and ports are accessible over the internet. Do not forget UDP protoco ! Check your top 10 udp open ports with online port scanning tools.

How To Scan UDP Ports

Nmap is one of the most used tools for port scanning. That's why we use Nmap for port scanning. Nmap has a wide variety of parameters and a lot of scripts to work on port scans.

What is UDP Protocol?

UDP (User Datagram Protocol) is a protocol (same as TCP) that defines rules to communicate with other systems in a network. TCP and UDP are both communication protocols in the network layer. But they are different from each other. TCP is connection-oriented, UDP is not. TCP makes sure that the messages reach the destination, UDP doesn't. UDP is used by protocols such as DNS, DHCP, TFTP, SNMP, RIP, VOIP. Also it is faster than TCP.

We scan only top 10 UDP ports. If you want to scan the most used 10 TCP ports, we have another top 10 tcp port scanner for this. Here is top 10 UDP ports.

Port Service
53 DNS
67 DHCP
123 Network Time Protocol (NTP)
135 DCE/RPC
137 NetBIOS
138 NetBIOS
161 SNMP
445 Microsoft-DS
631 Internet Printing Protocol (IPP)
1434 MSSQL


Some Advice for Common Problems

We can advice you a few to things to do for UDP ports

  1. If you do not use related service then stop it. Do not increase your attack surface. Stoping unnecessary services is one of the best practices and huge step in hardening operation systems. For example if port 53 open for DNS and you do not using it, stop DNS services.
  2. You should restrict access. Use either a firewall to allow specific IP addresses for your port if you can. Or change your service settings to make accessible only from localhost.
  3. Make sure your softwares are up to date. Do not miss any security patches.
  4. Use strong authentication mechanism. Whole internet are scanning by attackers to detect weak authentication mechanism.