CyberHunter
Local dataset, no network
// Other services

Port 1587: pra_elmd

Port 1587 is assigned by IANA to pra_elmd (pra_elmd), pra-elmd (pra_elmd IANA assigned this well-formed service name as a replacement for "pra_elmd".).

1587

How pra_elmd works

Other services
client:1587pra_elmdresponse client:1587pra_elmdresponse

The client sends a request to port 1587 and the pra_elmd service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 1587 dangerous?

We have no specific security note for port 1587. 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 1587

ServicePortTransportDescriptionReferenceUpdated
pra_elmd 1587 TCP, UDP pra_elmd - -
pra-elmd 1587 TCP, UDP pra_elmd IANA assigned this well-formed service name as a replacement for "pra_elmd". - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1587, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1587'      # process listening on 1587
sudo lsof -nP -i :1587

macOS

sudo lsof -nP -i :1587

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1587 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1587
netstat -ano | findstr :1587

From another machine

nmap -p 1587 -sV <host>
sudo nmap -sU -p 1587 <host>
nc -zv <host> 1587

Block it in the firewall

sudo ufw deny 1587/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1587" -Direction Inbound -LocalPort 1587 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1587 used for?

Port 1587 is assigned by IANA to pra_elmd (pra_elmd), pra-elmd (pra_elmd IANA assigned this well-formed service name as a replacement for "pra_elmd".).

Is port 1587 TCP or UDP?

Port 1587 is registered for TCP and UDP.

Is it safe to open port 1587?

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 1587 is open?

On Linux run "ss -ltnup 'sport = :1587'", on macOS "lsof -nP -i :1587", and on Windows "netstat -ano | findstr :1587" to see the local process. From another machine, "nmap -p 1587 <host>" shows whether it is reachable.

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