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// Other services

Port 7701: SCF nFAPI defining MAC/PHY split

Port 7701 is assigned by IANA to nfapi (SCF nFAPI defining MAC/PHY split).

7701

How nfapi works

Other services
client:7701nfapiresponse client:7701nfapiresponse

The client sends a request to port 7701 and the nfapi service answers.

Transport
SCTP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 7701 dangerous?

We have no specific security note for port 7701. 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 7701

ServicePortTransportDescriptionReferenceUpdated
nfapi 7701 SCTP SCF nFAPI defining MAC/PHY split - 2017-01-24
-7701-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 7701, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7701'      # process listening on 7701
sudo lsof -nP -i :7701

macOS

sudo lsof -nP -i :7701

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7701 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7701
netstat -ano | findstr :7701

From another machine

nmap -p 7701 -sV <host>
nc -zv <host> 7701

Block it in the firewall

sudo ufw deny 7701/sctp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7701" -Direction Inbound -LocalPort 7701 -Protocol SCTP -Action Block  # Windows
04 FAQ
What is port 7701 used for?

Port 7701 is assigned by IANA to nfapi (SCF nFAPI defining MAC/PHY split).

Is port 7701 TCP or UDP?

Port 7701 is registered for SCTP.

Is it safe to open port 7701?

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 7701 is open?

On Linux run "ss -ltnup 'sport = :7701'", on macOS "lsof -nP -i :7701", and on Windows "netstat -ano | findstr :7701" to see the local process. From another machine, "nmap -p 7701 <host>" shows whether it is reachable.

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