All ports
Port1977/UDP
tcoaddressbookPort
1977
Protocol
UDP
Category
Registered
Service
tcoaddressbook
What is port 1977?
Port 1977/UDP is a Registered port, registered with IANA for specific applications. It is associated with the tcoaddressbook service.
TCO Address Book
Useful commands
nmapnmap -p 1977 -sV example.comnetcatnc -zv example.com 1977curlcurl -v http://example.com:1977/telnettelnet example.com 1977bash(echo > /dev/udp/example.com/1977) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 1977/udpDeny
sudo ufw deny 1977/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 1977 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 1977 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=1977/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 1977" dir=in action=allow protocol=UDP localport=1977Security 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- Outdated versions with vulnerabilities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 1977/UDP?
Port 1977/UDP is associated with the tcoaddressbook service. TCO Address Book
Is it safe to expose port 1977 to the Internet?
It depends on the service and configuration. Port 1977 (tcoaddressbook) is a Registered 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 1977 is open?
You can use nmap: `nmap -p 1977 -sV example.com`, netcat: `nc -zv example.com 1977`, or the bash command: `(echo > /dev/udp/example.com/1977) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 1977 on my firewall?
On Linux with UFW: `sudo ufw allow 1977/udp` (open) or `sudo ufw deny 1977/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 1977 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 1977" dir=in action=allow protocol=UDP localport=1977`.
What applications and services use port 1977?
Port 1977/UDP is used by the tcoaddressbook service. Specific uses depend on the software and configuration. Check our related tools section for more information.