- 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.
Port 196: DNSIX Session Mgt Module Audit Redir
Port 196 is assigned by IANA to dn6-smm-red (DNSIX Session Mgt Module Audit Redir).
196
How dn6-smm-red works
Other servicesThe client sends a request to port 196 and the dn6-smm-red 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
Is port 196 dangerous?
We have no specific security note for port 196. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 196
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| dn6-smm-red | 196 | TCP, UDP | DNSIX Session Mgt Module Audit Redir | - | - |
// source: IANA service name and port number registry
Which program uses port 196, and is it reachable?
Linux
sudo ss -ltnup 'sport = :196' # process listening on 196
sudo lsof -nP -i :196macOS
sudo lsof -nP -i :196
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 196 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 196 netstat -ano | findstr :196
From another machine
nmap -p 196 -sV <host> sudo nmap -sU -p 196 <host> nc -zv <host> 196
Block it in the firewall
sudo ufw deny 196/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 196" -Direction Inbound -LocalPort 196 -Protocol TCP -Action Block # Windows
What is port 196 used for?
Port 196 is assigned by IANA to dn6-smm-red (DNSIX Session Mgt Module Audit Redir).
Is port 196 TCP or UDP?
Port 196 is registered for TCP and UDP.
Is it safe to open port 196?
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 196 is open?
On Linux run "ss -ltnup 'sport = :196'", on macOS "lsof -nP -i :196", and on Windows "netstat -ano | findstr :196" to see the local process. From another machine, "nmap -p 196 <host>" shows whether it is reachable.
Other other services ports
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