CyberHunter
Local dataset, no network
// Other services

Port 5627: Node Initiated Network Association Forma

Port 5627 is assigned by IANA to ninaf (Node Initiated Network Association Forma).

5627

How ninaf works

Other services
client:5627ninafresponse client:5627ninafresponse

The client sends a request to port 5627 and the ninaf 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
Registered (1024-49151)
Category
Other services
01 Security

Is port 5627 dangerous?

We have no specific security note for port 5627. 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 5627

ServicePortTransportDescriptionReferenceUpdated
ninaf 5627 TCP, UDP Node Initiated Network Association Forma - 2006-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 5627, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5627'      # process listening on 5627
sudo lsof -nP -i :5627

macOS

sudo lsof -nP -i :5627

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5627 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5627
netstat -ano | findstr :5627

From another machine

nmap -p 5627 -sV <host>
sudo nmap -sU -p 5627 <host>
nc -zv <host> 5627

Block it in the firewall

sudo ufw deny 5627/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5627" -Direction Inbound -LocalPort 5627 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5627 used for?

Port 5627 is assigned by IANA to ninaf (Node Initiated Network Association Forma).

Is port 5627 TCP or UDP?

Port 5627 is registered for TCP and UDP.

Is it safe to open port 5627?

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 5627 is open?

On Linux run "ss -ltnup 'sport = :5627'", on macOS "lsof -nP -i :5627", and on Windows "netstat -ano | findstr :5627" to see the local process. From another machine, "nmap -p 5627 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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