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

Port 86: Micro Focus Cobol

Port 86 is assigned by IANA to mfcobol (Micro Focus Cobol).

86

How mfcobol works

Other services
client:86mfcobolresponse client:86mfcobolresponse

The client sends a request to port 86 and the mfcobol 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 86 dangerous?

We have no specific security note for port 86. 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 86

ServicePortTransportDescriptionReferenceUpdated
mfcobol 86 TCP, UDP Micro Focus Cobol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 86, and is it reachable?

Linux

sudo ss -ltnup 'sport = :86'      # process listening on 86
sudo lsof -nP -i :86

macOS

sudo lsof -nP -i :86

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 86 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 86
netstat -ano | findstr :86

From another machine

nmap -p 86 -sV <host>
sudo nmap -sU -p 86 <host>
nc -zv <host> 86

Block it in the firewall

sudo ufw deny 86/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 86" -Direction Inbound -LocalPort 86 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 86 used for?

Port 86 is assigned by IANA to mfcobol (Micro Focus Cobol).

Is port 86 TCP or UDP?

Port 86 is registered for TCP and UDP.

Is it safe to open port 86?

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 86 is open?

On Linux run "ss -ltnup 'sport = :86'", on macOS "lsof -nP -i :86", and on Windows "netstat -ano | findstr :86" to see the local process. From another machine, "nmap -p 86 <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