CyberHunter
Local dataset, no network
// Other services

Port 1751: SwiftNet

Port 1751 is assigned by IANA to swiftnet (SwiftNet).

1751

How swiftnet works

Other services
client:1751swiftnetresponse client:1751swiftnetresponse

The client sends a request to port 1751 and the swiftnet 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 1751 dangerous?

We have no specific security note for port 1751. 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 1751

ServicePortTransportDescriptionReferenceUpdated
swiftnet 1751 TCP, UDP SwiftNet - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1751, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1751'      # process listening on 1751
sudo lsof -nP -i :1751

macOS

sudo lsof -nP -i :1751

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1751 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1751
netstat -ano | findstr :1751

From another machine

nmap -p 1751 -sV <host>
sudo nmap -sU -p 1751 <host>
nc -zv <host> 1751

Block it in the firewall

sudo ufw deny 1751/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1751" -Direction Inbound -LocalPort 1751 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1751 used for?

Port 1751 is assigned by IANA to swiftnet (SwiftNet).

Is port 1751 TCP or UDP?

Port 1751 is registered for TCP and UDP.

Is it safe to open port 1751?

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 1751 is open?

On Linux run "ss -ltnup 'sport = :1751'", on macOS "lsof -nP -i :1751", and on Windows "netstat -ano | findstr :1751" to see the local process. From another machine, "nmap -p 1751 <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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