CyberHunter
Local dataset, no network
// Other services

Port 1737: ultimad

Port 1737 is assigned by IANA to ultimad (ultimad).

1737

How ultimad works

Other services
client:1737ultimadresponse client:1737ultimadresponse

The client sends a request to port 1737 and the ultimad 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 1737 dangerous?

We have no specific security note for port 1737. 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 1737

ServicePortTransportDescriptionReferenceUpdated
ultimad 1737 TCP, UDP ultimad - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1737, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1737'      # process listening on 1737
sudo lsof -nP -i :1737

macOS

sudo lsof -nP -i :1737

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1737 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1737
netstat -ano | findstr :1737

From another machine

nmap -p 1737 -sV <host>
sudo nmap -sU -p 1737 <host>
nc -zv <host> 1737

Block it in the firewall

sudo ufw deny 1737/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1737" -Direction Inbound -LocalPort 1737 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1737 used for?

Port 1737 is assigned by IANA to ultimad (ultimad).

Is port 1737 TCP or UDP?

Port 1737 is registered for TCP and UDP.

Is it safe to open port 1737?

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 1737 is open?

On Linux run "ss -ltnup 'sport = :1737'", on macOS "lsof -nP -i :1737", and on Windows "netstat -ano | findstr :1737" to see the local process. From another machine, "nmap -p 1737 <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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