- 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 1998: cisco X.25 service (XOT)
Port 1998 is assigned by IANA to x25-svc-port (cisco X.25 service (XOT)).
1998
How x25-svc-port works
Other servicesThe client sends a request to port 1998 and the x25-svc-port 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 1998 dangerous?
We have no specific security note for port 1998. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 1998
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| x25-svc-port | 1998 | TCP, UDP | cisco X.25 service (XOT) | - | - |
// source: IANA service name and port number registry
Which program uses port 1998, and is it reachable?
Linux
sudo ss -ltnup 'sport = :1998' # process listening on 1998
sudo lsof -nP -i :1998macOS
sudo lsof -nP -i :1998
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1998 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 1998 netstat -ano | findstr :1998
From another machine
nmap -p 1998 -sV <host> sudo nmap -sU -p 1998 <host> nc -zv <host> 1998
Block it in the firewall
sudo ufw deny 1998/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 1998" -Direction Inbound -LocalPort 1998 -Protocol TCP -Action Block # Windows
What is port 1998 used for?
Port 1998 is assigned by IANA to x25-svc-port (cisco X.25 service (XOT)).
Is port 1998 TCP or UDP?
Port 1998 is registered for TCP and UDP.
Is it safe to open port 1998?
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 1998 is open?
On Linux run "ss -ltnup 'sport = :1998'", on macOS "lsof -nP -i :1998", and on Windows "netstat -ano | findstr :1998" to see the local process. From another machine, "nmap -p 1998 <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