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// Other services

Port 477: ss7ns

Port 477 is assigned by IANA to ss7ns (ss7ns).

477

How ss7ns works

Other services
client:477ss7nsresponse client:477ss7nsresponse

The client sends a request to port 477 and the ss7ns 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 477 dangerous?

We have no specific security note for port 477. 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 477

ServicePortTransportDescriptionReferenceUpdated
ss7ns 477 TCP, UDP ss7ns - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 477, and is it reachable?

Linux

sudo ss -ltnup 'sport = :477'      # process listening on 477
sudo lsof -nP -i :477

macOS

sudo lsof -nP -i :477

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 477 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 477
netstat -ano | findstr :477

From another machine

nmap -p 477 -sV <host>
sudo nmap -sU -p 477 <host>
nc -zv <host> 477

Block it in the firewall

sudo ufw deny 477/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 477" -Direction Inbound -LocalPort 477 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 477 used for?

Port 477 is assigned by IANA to ss7ns (ss7ns).

Is port 477 TCP or UDP?

Port 477 is registered for TCP and UDP.

Is it safe to open port 477?

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 477 is open?

On Linux run "ss -ltnup 'sport = :477'", on macOS "lsof -nP -i :477", and on Windows "netstat -ano | findstr :477" to see the local process. From another machine, "nmap -p 477 <host>" shows whether it is reachable.

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