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// Network services

Port 4154: atlinks device discovery

Port 4154 is assigned by IANA to atlinks (atlinks device discovery).

4154

How atlinks works

Network services
client:4154atlinksresponse client:4154atlinksresponse

The client sends a request to port 4154 and the atlinks 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
Network services
01 Security

Is port 4154 dangerous?

We have no specific security note for port 4154. Its risk depends on the program actually listening on it. General advice for network services services:

  • 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.
02 Registry

IANA registry entries for port 4154

ServicePortTransportDescriptionReferenceUpdated
atlinks 4154 TCP, UDP atlinks device discovery - 2002-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 4154, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4154'      # process listening on 4154
sudo lsof -nP -i :4154

macOS

sudo lsof -nP -i :4154

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4154 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4154
netstat -ano | findstr :4154

From another machine

nmap -p 4154 -sV <host>
sudo nmap -sU -p 4154 <host>
nc -zv <host> 4154

Block it in the firewall

sudo ufw deny 4154/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4154" -Direction Inbound -LocalPort 4154 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4154 used for?

Port 4154 is assigned by IANA to atlinks (atlinks device discovery).

Is port 4154 TCP or UDP?

Port 4154 is registered for TCP and UDP.

Is it safe to open port 4154?

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 4154 is open?

On Linux run "ss -ltnup 'sport = :4154'", on macOS "lsof -nP -i :4154", and on Windows "netstat -ano | findstr :4154" to see the local process. From another machine, "nmap -p 4154 <host>" shows whether it is reachable.

05 Related
: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

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