All ports
Port88/UDP
kerberosPort
88
Protocol
UDP
Category
Well-Known
Service
kerberos
What is port 88?
Port 88/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the kerberos service.
Kerberos
Useful commands
nmapnmap -p 88 -sV example.comnetcatnc -zv example.com 88curlcurl -v http://example.com:88/telnettelnet example.com 88bash(echo > /dev/udp/example.com/88) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 88/udpDeny
sudo ufw deny 88/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 88 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 88 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=88/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 88" dir=in action=allow protocol=UDP localport=88Security Risks
- Unauthorized access to the service
- Data exposure if the service is unauthenticated
- Outdated versions with vulnerabilities
- Incorrect service configuration
Frequently Asked Questions
What service runs on port 88/UDP?
Port 88/UDP is associated with the kerberos service. Kerberos
Is it safe to expose port 88 to the Internet?
It depends on the service and configuration. Port 88 (kerberos) is a Well-Known port. If you need to expose it, keep the service updated, use strong authentication, and configure a firewall. It's always recommended to restrict access by IP when possible.
How do I check if port 88 is open?
You can use nmap: `nmap -p 88 -sV example.com`, netcat: `nc -zv example.com 88`, or the bash command: `(echo > /dev/udp/example.com/88) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 88 on my firewall?
On Linux with UFW: `sudo ufw allow 88/udp` (open) or `sudo ufw deny 88/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 88 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 88" dir=in action=allow protocol=UDP localport=88`.
What applications and services use port 88?
Port 88/UDP is used by the kerberos service. Specific uses depend on the software and configuration. Check our related tools section for more information.