CyberHunter
Local dataset, no network
// Other services

Port 3915: Auto-Graphics Cataloging

Port 3915 is assigned by IANA to agcat (Auto-Graphics Cataloging).

3915

How agcat works

Other services
client:3915agcatresponse client:3915agcatresponse

The client sends a request to port 3915 and the agcat 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
01 Security

Is port 3915 dangerous?

We have no specific security note for port 3915. 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 3915

ServicePortTransportDescriptionReferenceUpdated
agcat 3915 TCP, UDP Auto-Graphics Cataloging - 2003-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 3915, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3915'      # process listening on 3915
sudo lsof -nP -i :3915

macOS

sudo lsof -nP -i :3915

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3915 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3915
netstat -ano | findstr :3915

From another machine

nmap -p 3915 -sV <host>
sudo nmap -sU -p 3915 <host>
nc -zv <host> 3915

Block it in the firewall

sudo ufw deny 3915/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3915" -Direction Inbound -LocalPort 3915 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3915 used for?

Port 3915 is assigned by IANA to agcat (Auto-Graphics Cataloging).

Is port 3915 TCP or UDP?

Port 3915 is registered for TCP and UDP.

Is it safe to open port 3915?

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 3915 is open?

On Linux run "ss -ltnup 'sport = :3915'", on macOS "lsof -nP -i :3915", and on Windows "netstat -ano | findstr :3915" to see the local process. From another machine, "nmap -p 3915 <host>" shows whether it is reachable.

05 Related
: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

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