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// Other services

Port 193: Spider Remote Monitoring Protocol

Port 193 is assigned by IANA to srmp (Spider Remote Monitoring Protocol).

193

How srmp works

Other services
client:193srmpresponse client:193srmpresponse

The client sends a request to port 193 and the srmp 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 193 dangerous?

We have no specific security note for port 193. 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 193

ServicePortTransportDescriptionReferenceUpdated
srmp 193 TCP, UDP Spider Remote Monitoring Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 193, and is it reachable?

Linux

sudo ss -ltnup 'sport = :193'      # process listening on 193
sudo lsof -nP -i :193

macOS

sudo lsof -nP -i :193

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 193 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 193
netstat -ano | findstr :193

From another machine

nmap -p 193 -sV <host>
sudo nmap -sU -p 193 <host>
nc -zv <host> 193

Block it in the firewall

sudo ufw deny 193/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 193" -Direction Inbound -LocalPort 193 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 193 used for?

Port 193 is assigned by IANA to srmp (Spider Remote Monitoring Protocol).

Is port 193 TCP or UDP?

Port 193 is registered for TCP and UDP.

Is it safe to open port 193?

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 193 is open?

On Linux run "ss -ltnup 'sport = :193'", on macOS "lsof -nP -i :193", and on Windows "netstat -ano | findstr :193" to see the local process. From another machine, "nmap -p 193 <host>" shows whether it is reachable.

05 Related
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