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// Other services

Port 5100: Socalia service mux

Port 5100 is assigned by IANA to socalia (Socalia service mux).

5100

How socalia works

Other services
client:5100socaliaresponse client:5100socaliaresponse

The client sends a request to port 5100 and the socalia 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 5100 dangerous?

We have no specific security note for port 5100. 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 5100

ServicePortTransportDescriptionReferenceUpdated
socalia 5100 TCP, UDP Socalia service mux - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 5100, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5100'      # process listening on 5100
sudo lsof -nP -i :5100

macOS

sudo lsof -nP -i :5100

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5100 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5100
netstat -ano | findstr :5100

From another machine

nmap -p 5100 -sV <host>
sudo nmap -sU -p 5100 <host>
nc -zv <host> 5100

Block it in the firewall

sudo ufw deny 5100/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5100" -Direction Inbound -LocalPort 5100 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5100 used for?

Port 5100 is assigned by IANA to socalia (Socalia service mux).

Is port 5100 TCP or UDP?

Port 5100 is registered for TCP and UDP.

Is it safe to open port 5100?

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 5100 is open?

On Linux run "ss -ltnup 'sport = :5100'", on macOS "lsof -nP -i :5100", and on Windows "netstat -ano | findstr :5100" to see the local process. From another machine, "nmap -p 5100 <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

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