TCP Port 68 – DHCP Client (Dynamic Host Configuration Protocol)
Port 68 is the client-side counterpart to port 67 in the Dynamic Host Configuration Protocol (DHCP) exchange.
Reference information for TCP and UDP network ports, including service assignments, IDS rule references, malware activity indicators, and security context.
TCP Port 104 – acr-nema
TCP port 104 is assigned to acr-nema by IANA. Referenced in 2 IDS rules, with low malware activity observed in monitored traffic.
TCP Port 22 – SSH (Secure Shell)
Port 22 is the standard port for SSH, the Secure Shell protocol used to log into and administer remote computers across an encrypted channel.
UDP Port 22 – SSH (Secure Shell)
UDP port 22 is assigned to ssh by IANA. Referenced in 1 IDS rule, with low malware activity observed in monitored traffic.
TCP Port 23 – Telnet (Legacy Remote Terminal)
Port 23 is the standard port for Telnet, an early protocol for logging into remote computers across a terminal connection.
UDP Port 23 – Telnet (Legacy Remote Terminal)
UDP port 23 is assigned to telnet by IANA. Referenced in 1 IDS rule, with no notable malware activity in monitored traffic.
TCP Port 25 – SMTP (Simple Mail Transfer Protocol)
Port 25 is the original port for SMTP, the Simple Mail Transfer Protocol that moves email between mail servers across the internet.
UDP Port 25 – SMTP (Simple Mail Transfer Protocol)
UDP port 25 is assigned to smtp by IANA. Referenced in 0 IDS rules, with no notable malware activity in monitored traffic.
TCP Port 27 – nsw-fe
TCP port 27 is assigned to nsw-fe by IANA. Referenced in 1 IDS rule, with low malware activity observed in monitored traffic.
UDP Port 21 – FTP (File Transfer Protocol)
UDP port 21 is assigned to ftp by IANA. Referenced in 0 IDS rules, with no notable malware activity in monitored traffic.
UDP Port 7 – echo
UDP port 7 is assigned to echo by IANA. Referenced in 2 IDS rules, with no notable malware activity in monitored traffic.
UDP Port 9 – discard
UDP port 9 is assigned to discard by IANA. Referenced in 1 IDS rule, with no notable malware activity in monitored traffic.
UDP Port 19 – chargen
UDP port 19 is assigned to chargen by IANA. Referenced in 1 IDS rule, with no notable malware activity in monitored traffic.
TCP Port 20 – ftp-data
TCP port 20 is assigned to ftp-data by IANA. Referenced in 12 IDS rules, with high malware activity observed in monitored traffic.
TCP Port 21 – FTP (File Transfer Protocol)
Port 21 is the standard control port for FTP, the File Transfer Protocol used since the early 1970s to transfer files between computers across a network.
UDP Port 80 – HTTP (Hypertext Transfer Protocol)
UDP port 80 is assigned to http by IANA. Referenced in 2 IDS rules, with low malware activity observed in monitored traffic.
TCP Port 80 – HTTP (Hypertext Transfer Protocol)
Port 80 is the original port for HTTP, the Hypertext Transfer Protocol that web browsers and web servers use to exchange web pages, images, scripts