CyberHunter
Local dataset, no network
// Other services

Port 4737: IPDR/SP

Port 4737 is assigned by IANA to ipdr-sp (IPDR/SP).

4737

How ipdr-sp works

Other services
client:4737ipdr-spresponse client:4737ipdr-spresponse

The client sends a request to port 4737 and the ipdr-sp 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 4737 dangerous?

We have no specific security note for port 4737. 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 4737

ServicePortTransportDescriptionReferenceUpdated
ipdr-sp 4737 TCP, UDP IPDR/SP - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 4737, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4737'      # process listening on 4737
sudo lsof -nP -i :4737

macOS

sudo lsof -nP -i :4737

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4737 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4737
netstat -ano | findstr :4737

From another machine

nmap -p 4737 -sV <host>
sudo nmap -sU -p 4737 <host>
nc -zv <host> 4737

Block it in the firewall

sudo ufw deny 4737/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4737" -Direction Inbound -LocalPort 4737 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4737 used for?

Port 4737 is assigned by IANA to ipdr-sp (IPDR/SP).

Is port 4737 TCP or UDP?

Port 4737 is registered for TCP and UDP.

Is it safe to open port 4737?

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 4737 is open?

On Linux run "ss -ltnup 'sport = :4737'", on macOS "lsof -nP -i :4737", and on Windows "netstat -ano | findstr :4737" to see the local process. From another machine, "nmap -p 4737 <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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