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// Messaging & queues

Port 1881: IBM WebSphere MQ Everyplace

Port 1881 is assigned by IANA to ibm-mqseries2 (IBM WebSphere MQ Everyplace).

1881

How ibm-mqseries2 works

Messaging & queues
producerconsumerqueueibm-mqseries2 producerconsumerqueueibm-mqseries2

Producers publish messages into a queue on port 1881; consumers pick them up in order, at their own pace.

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
Messaging & queues
01 Security

Is port 1881 dangerous?

We have no specific security note for port 1881. Its risk depends on the program actually listening on it. General advice for messaging & queues services:

  • Require authentication and TLS on brokers and coordination services.
  • Restrict clients by network and per-topic or per-queue permissions.
  • Remove default accounts.
02 Registry

IANA registry entries for port 1881

ServicePortTransportDescriptionReferenceUpdated
ibm-mqseries2 1881 TCP, UDP IBM WebSphere MQ Everyplace - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1881, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1881'      # process listening on 1881
sudo lsof -nP -i :1881

macOS

sudo lsof -nP -i :1881

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1881 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1881
netstat -ano | findstr :1881

From another machine

nmap -p 1881 -sV <host>
sudo nmap -sU -p 1881 <host>
nc -zv <host> 1881

Block it in the firewall

sudo ufw deny 1881/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1881" -Direction Inbound -LocalPort 1881 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1881 used for?

Port 1881 is assigned by IANA to ibm-mqseries2 (IBM WebSphere MQ Everyplace).

Is port 1881 TCP or UDP?

Port 1881 is registered for TCP and UDP.

Is it safe to open port 1881?

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. Require authentication and TLS on brokers and coordination services.

How do I check if port 1881 is open?

On Linux run "ss -ltnup 'sport = :1881'", on macOS "lsof -nP -i :1881", and on Windows "netstat -ano | findstr :1881" to see the local process. From another machine, "nmap -p 1881 <host>" shows whether it is reachable.

05 Related
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