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// Other services

Port 4985: GER HC Standard

Port 4985 is assigned by IANA to gerhcs (GER HC Standard).

4985

How gerhcs works

Other services
client:4985gerhcsresponse client:4985gerhcsresponse

The client sends a request to port 4985 and the gerhcs 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
Other services
01 Security

Is port 4985 dangerous?

We have no specific security note for port 4985. Its risk depends on the program actually listening on it. General advice for other services services:

  • 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.
02 Registry

IANA registry entries for port 4985

ServicePortTransportDescriptionReferenceUpdated
gerhcs 4985 TCP GER HC Standard - 2009-09-25
-4985-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4985, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4985'      # process listening on 4985
sudo lsof -nP -i :4985

macOS

sudo lsof -nP -i :4985

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4985 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4985
netstat -ano | findstr :4985

From another machine

nmap -p 4985 -sV <host>
nc -zv <host> 4985

Block it in the firewall

sudo ufw deny 4985/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4985" -Direction Inbound -LocalPort 4985 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4985 used for?

Port 4985 is assigned by IANA to gerhcs (GER HC Standard).

Is port 4985 TCP or UDP?

Port 4985 is registered for TCP.

Is it safe to open port 4985?

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 4985 is open?

On Linux run "ss -ltnup 'sport = :4985'", on macOS "lsof -nP -i :4985", and on Windows "netstat -ano | findstr :4985" to see the local process. From another machine, "nmap -p 4985 <host>" shows whether it is reachable.

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