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// Other services

Port 1187: Alias Service

Port 1187 is assigned by IANA to alias (Alias Service).

1187

How alias works

Other services
client:1187aliasresponse client:1187aliasresponse

The client sends a request to port 1187 and the alias 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 1187 dangerous?

We have no specific security note for port 1187. 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 1187

ServicePortTransportDescriptionReferenceUpdated
alias 1187 TCP, UDP Alias Service - 2004-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 1187, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1187'      # process listening on 1187
sudo lsof -nP -i :1187

macOS

sudo lsof -nP -i :1187

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1187 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1187
netstat -ano | findstr :1187

From another machine

nmap -p 1187 -sV <host>
sudo nmap -sU -p 1187 <host>
nc -zv <host> 1187

Block it in the firewall

sudo ufw deny 1187/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1187" -Direction Inbound -LocalPort 1187 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1187 used for?

Port 1187 is assigned by IANA to alias (Alias Service).

Is port 1187 TCP or UDP?

Port 1187 is registered for TCP and UDP.

Is it safe to open port 1187?

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 1187 is open?

On Linux run "ss -ltnup 'sport = :1187'", on macOS "lsof -nP -i :1187", and on Windows "netstat -ano | findstr :1187" to see the local process. From another machine, "nmap -p 1187 <host>" shows whether it is reachable.

05 Related
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