Port 68: DHCP client
Port 68 is the DHCP client port. A device sends its DHCPDISCOVER and DHCPREQUEST from here and receives the lease offer from the server on port 67.
UDPCore servicesUnencrypted by defaultIANA assigned
| Port number | 68 |
|---|---|
| Service | DHCP client (BOOTP) |
| Protocol | UDP |
| Category | Core services |
| Default encryption | No |
Security note. Port 68 is not encrypted by default. Restrict it to trusted networks, or use an encrypted alternative where one exists, to avoid exposing credentials and data in transit.
Frequently asked questions
What is port 68 used for?
Port 68 is the DHCP client port. A device sends its DHCPDISCOVER and DHCPREQUEST from here and receives the lease offer from the server on port 67.
Is port 68 TCP or UDP?
Port 68 (DHCP client) uses UDP.
Is port 68 secure?
Port 68 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 68 on my firewall?
Only if you specifically need DHCP client. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.