Port 67 — DHCP Server

UDP · Port 67 is used for the Dynamic Host Configuration Protocol (DHCP) server, which assigns IP addresses and other network settings to devices on a network. This service plays a crucial role in network security as it helps maintain network topology and ensures only authorized devices can access the network.

Port Number: 67
Service Name: DHCP Server
Protocol: UDP
Common Software: ISC DHCP, dnsmasq

Security Notes

Review IANA registry for port 67 usage. Apply principle of least privilege - only open ports that are required.

FAQ

What is port 67 used for?

Port 67 is used for DHCP Server. Port 67 is used for the Dynamic Host Configuration Protocol (DHCP) server, which assigns IP addresses and other network settings to devices on a network. This service plays a crucial role in network security as it helps maintain network topology and ensures only authorized devices can access the network. Common software: ISC DHCP, dnsmasq.

Is port 67 dangerous to leave open?

Review IANA registry for port 67 usage. Apply principle of least privilege - only open ports that are required.

How do I check if port 67 is open?

Use nmap: nmap -p 67 <target> or check locally: ss -tlnp | rg 67