All ports
Port197/UDP
dlsPort
197
Protocol
UDP
Category
Well-Known
Service
dls
What is port 197?
Port 197/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the dls service.
Directory Location Service
Useful commands
nmapnmap -p 197 -sV example.comnetcatnc -zv example.com 197curlcurl -v http://example.com:197/telnettelnet example.com 197bash(echo > /dev/udp/example.com/197) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 197/udpDeny
sudo ufw deny 197/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 197 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 197 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=197/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 197" dir=in action=allow protocol=UDP localport=197Security 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- Outdated versions with vulnerabilities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 197/UDP?
Port 197/UDP is associated with the dls service. Directory Location Service
Is it safe to expose port 197 to the Internet?
It depends on the service and configuration. Port 197 (dls) 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 197 is open?
You can use nmap: `nmap -p 197 -sV example.com`, netcat: `nc -zv example.com 197`, or the bash command: `(echo > /dev/udp/example.com/197) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 197 on my firewall?
On Linux with UFW: `sudo ufw allow 197/udp` (open) or `sudo ufw deny 197/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 197 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 197" dir=in action=allow protocol=UDP localport=197`.
What applications and services use port 197?
Port 197/UDP is used by the dls service. Specific uses depend on the software and configuration. Check our related tools section for more information.