Port 123 (tcp/udp) - Online TCP UDP port finder - adminsub.net

When operating over UDP, the client sends a (typically empty) datagram to UDP port 37. The server responds with a single datagram of length 4 containing the time. There is no connection setup or teardown. The TIME protocol has been superseded by the Network Time Protocol (NTP). ntp-info NSE Script - Nmap Gets the time and configuration variables from an NTP server. We send two requests: a time request and a "read variables" (opcode 2) control message. Without verbosity, the script shows the time and the value of the version , processor , system , refid , and stratum variables. NTP listening on UDP+TCP(!)/123 - linuxquestions.org

Dec 15, 2003

Troubleshoot Network Time Protocol (NTP) - Cisco

Network Time Protocol (NTP) is an application layer protocol used for clock synchronization between hosts on a TCP/IP network. The goal of NTP is to ensure that all computers on a network agree on the time, since even a small difference can create problems. NTP uses a well-known UDP port 123. The current version is NTPv4, and it is backward

Jul 02, 2018 Nmap scan specific udp port – Linux Hint Contrary to the open|filtered, the open result means the specified port sent a response. To use Nmap to scan a specific port use the -p flag to define the port followed by the -sU flag to enable UDP scan before specifying the target, to scan LinuxHint for the 123 UDP NTP port run: #