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// Other services

Port 1884: Internet Distance Map Svc

Port 1884 is assigned by IANA to idmaps (Internet Distance Map Svc).

1884

How idmaps works

Other services
client:1884idmapsresponse client:1884idmapsresponse

The client sends a request to port 1884 and the idmaps 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 1884 dangerous?

We have no specific security note for port 1884. 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 1884

ServicePortTransportDescriptionReferenceUpdated
idmaps 1884 TCP, UDP Internet Distance Map Svc - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1884, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1884'      # process listening on 1884
sudo lsof -nP -i :1884

macOS

sudo lsof -nP -i :1884

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1884 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1884
netstat -ano | findstr :1884

From another machine

nmap -p 1884 -sV <host>
sudo nmap -sU -p 1884 <host>
nc -zv <host> 1884

Block it in the firewall

sudo ufw deny 1884/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1884" -Direction Inbound -LocalPort 1884 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1884 used for?

Port 1884 is assigned by IANA to idmaps (Internet Distance Map Svc).

Is port 1884 TCP or UDP?

Port 1884 is registered for TCP and UDP.

Is it safe to open port 1884?

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 1884 is open?

On Linux run "ss -ltnup 'sport = :1884'", on macOS "lsof -nP -i :1884", and on Windows "netstat -ano | findstr :1884" to see the local process. From another machine, "nmap -p 1884 <host>" shows whether it is reachable.

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