All ports
Port1021/DCCP
exp1Port
1021
Protocol
DCCP
Category
Well-Known
Service
exp1
What is port 1021?
Port 1021/DCCP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the exp1 service.
RFC3692-style Experiment 1
Useful commands
nmapnmap -p 1021 -sV example.comnetcatnc -zv example.com 1021curlcurl -v http://example.com:1021/telnettelnet example.com 1021bash(echo > /dev/dccp/example.com/1021) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 1021/dccpDeny
sudo ufw deny 1021/dccpiptablesAllow
sudo iptables -A INPUT -p dccp --dport 1021 -j ACCEPTDeny
sudo iptables -D INPUT -p dccp --dport 1021 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=1021/dccpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 1021" dir=in action=allow protocol=DCCP localport=1021Security 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- Outdated versions with vulnerabilities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 1021/DCCP?
Port 1021/DCCP is associated with the exp1 service. RFC3692-style Experiment 1
Is it safe to expose port 1021 to the Internet?
It depends on the service and configuration. Port 1021 (exp1) 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 1021 is open?
You can use nmap: `nmap -p 1021 -sV example.com`, netcat: `nc -zv example.com 1021`, or the bash command: `(echo > /dev/dccp/example.com/1021) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 1021 on my firewall?
On Linux with UFW: `sudo ufw allow 1021/dccp` (open) or `sudo ufw deny 1021/dccp` (close). With iptables: `sudo iptables -A INPUT -p dccp --dport 1021 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 1021" dir=in action=allow protocol=DCCP localport=1021`.
What applications and services use port 1021?
Port 1021/DCCP is used by the exp1 service. Specific uses depend on the software and configuration. Check our related tools section for more information.