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// Other services

Port 772:

Port 772 is assigned by IANA to cycleserv2 ().

772

How cycleserv2 works

Other services
client:772cycleserv2response client:772cycleserv2response

The client sends a request to port 772 and the cycleserv2 service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 772 dangerous?

We have no specific security note for port 772. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 772

ServicePortTransportDescriptionReferenceUpdated
cycleserv2 772 TCP, UDP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 772, and is it reachable?

Linux

sudo ss -ltnup 'sport = :772'      # process listening on 772
sudo lsof -nP -i :772

macOS

sudo lsof -nP -i :772

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 772 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 772
netstat -ano | findstr :772

From another machine

nmap -p 772 -sV <host>
sudo nmap -sU -p 772 <host>
nc -zv <host> 772

Block it in the firewall

sudo ufw deny 772/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 772" -Direction Inbound -LocalPort 772 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 772 used for?

Port 772 is assigned by IANA to cycleserv2 ().

Is port 772 TCP or UDP?

Port 772 is registered for TCP and UDP.

Is it safe to open port 772?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 772 is open?

On Linux run "ss -ltnup 'sport = :772'", on macOS "lsof -nP -i :772", and on Windows "netstat -ano | findstr :772" to see the local process. From another machine, "nmap -p 772 <host>" shows whether it is reachable.

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