- Answer only the networks that need the service (no open resolvers, relays or reflectors).
- UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
- Disable legacy test services that have no use in production.
Port 18242: Checkpoint router monitoring
Port 18242 is assigned by IANA to iclid (Checkpoint router monitoring).
18242
How iclid works
Network servicesThe client sends a request to port 18242 and the iclid service answers.
- Transport
- TCP
- 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
- Network services
Is port 18242 dangerous?
We have no specific security note for port 18242. Its risk depends on the program actually listening on it. General advice for network services services:
IANA registry entries for port 18242
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| iclid | 18242 | TCP | Checkpoint router monitoring | - | 2012-06-28 |
| - | 18242 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 18242, and is it reachable?
Linux
sudo ss -ltnup 'sport = :18242' # process listening on 18242
sudo lsof -nP -i :18242macOS
sudo lsof -nP -i :18242
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 18242 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 18242 netstat -ano | findstr :18242
From another machine
nmap -p 18242 -sV <host> nc -zv <host> 18242
Block it in the firewall
sudo ufw deny 18242/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 18242" -Direction Inbound -LocalPort 18242 -Protocol TCP -Action Block # Windows
What is port 18242 used for?
Port 18242 is assigned by IANA to iclid (Checkpoint router monitoring).
Is port 18242 TCP or UDP?
Port 18242 is registered for TCP.
Is it safe to open port 18242?
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. Answer only the networks that need the service (no open resolvers, relays or reflectors).
How do I check if port 18242 is open?
On Linux run "ss -ltnup 'sport = :18242'", on macOS "lsof -nP -i :18242", and on Windows "netstat -ano | findstr :18242" to see the local process. From another machine, "nmap -p 18242 <host>" shows whether it is reachable.
Other network services ports
:53 DNS tcp · udp · moderate risk :135 MS RPC tcp · udp · high risk :123 NTP udp · tcp · moderate risk :67 DHCP server udp · tcp · moderate risk :111 rpcbind tcp · udp · high risk :9100 Raw printing (JetDirect) tcp · udp · high risk :631 IPP / CUPS tcp · udp · high risk :5353 mDNS udp · tcp · moderate risk