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// Other services

Port 5456: APC 5456

Port 5456 is assigned by IANA to apc-5456 (APC 5456).

5456

How apc-5456 works

Other services
client:5456apc-5456response client:5456apc-5456response

The client sends a request to port 5456 and the apc-5456 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 5456 dangerous?

We have no specific security note for port 5456. 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 5456

ServicePortTransportDescriptionReferenceUpdated
apc-5456 5456 TCP, UDP APC 5456 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5456, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5456'      # process listening on 5456
sudo lsof -nP -i :5456

macOS

sudo lsof -nP -i :5456

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5456 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5456
netstat -ano | findstr :5456

From another machine

nmap -p 5456 -sV <host>
sudo nmap -sU -p 5456 <host>
nc -zv <host> 5456

Block it in the firewall

sudo ufw deny 5456/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5456" -Direction Inbound -LocalPort 5456 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5456 used for?

Port 5456 is assigned by IANA to apc-5456 (APC 5456).

Is port 5456 TCP or UDP?

Port 5456 is registered for TCP and UDP.

Is it safe to open port 5456?

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 5456 is open?

On Linux run "ss -ltnup 'sport = :5456'", on macOS "lsof -nP -i :5456", and on Windows "netstat -ano | findstr :5456" to see the local process. From another machine, "nmap -p 5456 <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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