- Serve it over HTTPS only and check the HTTP security headers.
- Keep admin consoles and development servers off the Internet.
- Patch the application server and remove default credentials and sample apps.
Port 27504: Kopek HTTP Head Port
Port 27504 is assigned by IANA to kopek-httphead (Kopek HTTP Head Port).
27504
How kopek-httphead works
WebA browser sends an HTTP request to port 27504 and the kopek-httphead server sends the page back.
- 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
- Web
Is port 27504 dangerous?
We have no specific security note for port 27504. Its risk depends on the program actually listening on it. General advice for web services:
IANA registry entries for port 27504
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| kopek-httphead | 27504 | TCP, UDP | Kopek HTTP Head Port | - | 2002-07 |
// source: IANA service name and port number registry
Which program uses port 27504, and is it reachable?
Linux
sudo ss -ltnup 'sport = :27504' # process listening on 27504
sudo lsof -nP -i :27504macOS
sudo lsof -nP -i :27504
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 27504 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 27504 netstat -ano | findstr :27504
From another machine
nmap -p 27504 -sV <host> sudo nmap -sU -p 27504 <host> nc -zv <host> 27504
Block it in the firewall
sudo ufw deny 27504/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 27504" -Direction Inbound -LocalPort 27504 -Protocol TCP -Action Block # Windows
What is port 27504 used for?
Port 27504 is assigned by IANA to kopek-httphead (Kopek HTTP Head Port).
Is port 27504 TCP or UDP?
Port 27504 is registered for TCP and UDP.
Is it safe to open port 27504?
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. Serve it over HTTPS only and check the HTTP security headers.
How do I check if port 27504 is open?
On Linux run "ss -ltnup 'sport = :27504'", on macOS "lsof -nP -i :27504", and on Windows "netstat -ano | findstr :27504" to see the local process. From another machine, "nmap -p 27504 <host>" shows whether it is reachable.
Other web ports
:443 HTTPS tcp · udp · sctp · low risk :80 HTTP tcp · udp · sctp · moderate risk :8080 HTTP alternate tcp · udp · high risk :8443 HTTPS alternate tcp · udp · moderate risk :3000 Dev servers / Grafana tcp · udp · moderate risk :5000 Flask / Docker registry / UPnP tcp · udp · moderate risk :8000 HTTP alternate (dev) tcp · udp · moderate risk :8888 Jupyter / HTTP alternate tcp · udp · high risk