CyberHunter
LinkedIn profile - Bastien Cordier Email: contact@bastiencordier.pro
// Other services

Port 18881: Infotos

Port 18881 is assigned by IANA to infotos (Infotos).

18881

How infotos works

Other services
client:18881infotosresponse client:18881infotosresponse

The client sends a request to port 18881 and the infotos 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 18881 dangerous?

We have no specific security note for port 18881. 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 18881

ServicePortTransportDescriptionReferenceUpdated
infotos 18881 TCP, UDP Infotos - 2004-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 18881, and is it reachable?

Linux

sudo ss -ltnup 'sport = :18881'      # process listening on 18881
sudo lsof -nP -i :18881

macOS

sudo lsof -nP -i :18881

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 18881 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 18881
netstat -ano | findstr :18881

From another machine

nmap -p 18881 -sV <host>
sudo nmap -sU -p 18881 <host>
nc -zv <host> 18881

Block it in the firewall

sudo ufw deny 18881/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 18881" -Direction Inbound -LocalPort 18881 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 18881 used for?

Port 18881 is assigned by IANA to infotos (Infotos).

Is port 18881 TCP or UDP?

Port 18881 is registered for TCP and UDP.

Is it safe to open port 18881?

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 18881 is open?

On Linux run "ss -ltnup 'sport = :18881'", on macOS "lsof -nP -i :18881", and on Windows "netstat -ano | findstr :18881" to see the local process. From another machine, "nmap -p 18881 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

Latest vulnerability news

All news