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// Other services

Port 1581: MIL-2045-47001

Port 1581 is assigned by IANA to mil-2045-47001 (MIL-2045-47001).

1581

How mil-2045-47001 works

Other services
client:1581mil-2045-47001response client:1581mil-2045-47001response

The client sends a request to port 1581 and the mil-2045-47001 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 1581 dangerous?

We have no specific security note for port 1581. 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 1581

ServicePortTransportDescriptionReferenceUpdated
mil-2045-47001 1581 TCP, UDP MIL-2045-47001 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1581, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1581'      # process listening on 1581
sudo lsof -nP -i :1581

macOS

sudo lsof -nP -i :1581

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1581 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1581
netstat -ano | findstr :1581

From another machine

nmap -p 1581 -sV <host>
sudo nmap -sU -p 1581 <host>
nc -zv <host> 1581

Block it in the firewall

sudo ufw deny 1581/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1581" -Direction Inbound -LocalPort 1581 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1581 used for?

Port 1581 is assigned by IANA to mil-2045-47001 (MIL-2045-47001).

Is port 1581 TCP or UDP?

Port 1581 is registered for TCP and UDP.

Is it safe to open port 1581?

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 1581 is open?

On Linux run "ss -ltnup 'sport = :1581'", on macOS "lsof -nP -i :1581", and on Windows "netstat -ano | findstr :1581" to see the local process. From another machine, "nmap -p 1581 <host>" shows whether it is reachable.

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