Port93/TCP

dcp

Port

Protocol

TCP

What is port 93?

Port 93/TCP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the dcp service.

Device Control Protocol

Useful commands

nmapnmap -p 93 -sV example.com

netcatnc -zv example.com 93

curlcurl -v http://example.com:93/

telnettelnet example.com 93

bash(echo > /dev/tcp/example.com/93) 2>/dev/null

Firewall commands

UFWAllow

sudo ufw allow 93/tcp

Deny

sudo ufw deny 93/tcp

iptablesAllow

sudo iptables -A INPUT -p tcp --dport 93 -j ACCEPT

Deny

sudo iptables -D INPUT -p tcp --dport 93 -j ACCEPT

firewalldAllow

sudo firewall-cmd --permanent --add-port=93/tcp

WindowsAllow

netsh advfirewall firewall add rule name="Open Port 93" dir=in action=allow protocol=TCP localport=93

Security 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Outdated versions with vulnerabilities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 93/TCP?

Port 93/TCP is associated with the dcp service. Device Control Protocol

Is it safe to expose port 93 to the Internet?

It depends on the service and configuration. Port 93 (dcp) 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 93 is open?

You can use nmap: `nmap -p 93 -sV example.com`, netcat: `nc -zv example.com 93`, or the bash command: `(echo > /dev/tcp/example.com/93) 2>/dev/null && echo "Open" || echo "Closed"`.

How do I open or close port 93 on my firewall?

On Linux with UFW: `sudo ufw allow 93/tcp` (open) or `sudo ufw deny 93/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 93 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 93" dir=in action=allow protocol=TCP localport=93`.