- 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 1988: cisco RSRB Priority 2 port
Port 1988 is assigned by IANA to tr-rsrb-p2 (cisco RSRB Priority 2 port).
1988
How tr-rsrb-p2 works
Other servicesThe client sends a request to port 1988 and the tr-rsrb-p2 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
Is port 1988 dangerous?
We have no specific security note for port 1988. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 1988
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| tr-rsrb-p2 | 1988 | TCP, UDP | cisco RSRB Priority 2 port | - | - |
// source: IANA service name and port number registry
Which program uses port 1988, and is it reachable?
Linux
sudo ss -ltnup 'sport = :1988' # process listening on 1988
sudo lsof -nP -i :1988macOS
sudo lsof -nP -i :1988
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1988 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 1988 netstat -ano | findstr :1988
From another machine
nmap -p 1988 -sV <host> sudo nmap -sU -p 1988 <host> nc -zv <host> 1988
Block it in the firewall
sudo ufw deny 1988/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 1988" -Direction Inbound -LocalPort 1988 -Protocol TCP -Action Block # Windows
What is port 1988 used for?
Port 1988 is assigned by IANA to tr-rsrb-p2 (cisco RSRB Priority 2 port).
Is port 1988 TCP or UDP?
Port 1988 is registered for TCP and UDP.
Is it safe to open port 1988?
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 1988 is open?
On Linux run "ss -ltnup 'sport = :1988'", on macOS "lsof -nP -i :1988", and on Windows "netstat -ano | findstr :1988" to see the local process. From another machine, "nmap -p 1988 <host>" shows whether it is reachable.
Other other services ports
: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