Port 67: DHCP server
Server side of DHCP address assignment.
- Port
- 67
- Protocol
- UDP
- Service
- DHCP server
- Exposure
- Do not expose to the internet
What is port 67 used for?
Handing out IP addresses on a local network.
Is it safe to expose port 67 to the internet?
Keep it on the internal network only. Use DHCP snooping on switches to stop rogue servers.
If port 67 seems closed or unreachable
- Check that the DHCP server service is running and listening on port 67, not only on 127.0.0.1.
- Check the firewall on the host itself (Windows Defender Firewall, iptables, nftables, ufw) for a rule that allows UDP 67.
- If the host is behind a router, confirm the forwarding rule points to the correct internal address and that your internet provider does not use carrier-grade NAT.
- Test from outside your own network. A port can be open locally and blocked at the edge, or the other way round.
Using port 67 safely
Treat port 67 as an internal-only service. Reach it through a VPN or an SSH tunnel, restrict it by source address, and keep the software that listens on it patched.
Check whether port 67 is open on your host
The check connects from our server, so it shows what the internet can reach.
Open the port checker