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// DevOps, cloud & containers

Port 5638: Symantec Fingerprint Lookup and Container Reference Service

Port 5638 is assigned by IANA to flcrs (Symantec Fingerprint Lookup and Container Reference Service).

5638

How flcrs works

DevOps, cloud & containers
adminhostflcrs adminhostflcrs

Commands sent to port 5638 create and control containers or cluster resources on the host.

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
DevOps, cloud & containers
01 Security

Is port 5638 dangerous?

We have no specific security note for port 5638. Its risk depends on the program actually listening on it. General advice for devops, cloud & containers services:

  • Container and orchestration APIs give full control of hosts: require mutual TLS and RBAC.
  • Never expose them to the Internet.
  • Rotate tokens and certificates and audit who has access.
02 Registry

IANA registry entries for port 5638

ServicePortTransportDescriptionReferenceUpdated
flcrs 5638 TCP Symantec Fingerprint Lookup and Container Reference Service - 2012-01-03
-5638-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5638, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5638'      # process listening on 5638
sudo lsof -nP -i :5638

macOS

sudo lsof -nP -i :5638

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5638 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5638
netstat -ano | findstr :5638

From another machine

nmap -p 5638 -sV <host>
nc -zv <host> 5638

Block it in the firewall

sudo ufw deny 5638/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5638" -Direction Inbound -LocalPort 5638 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5638 used for?

Port 5638 is assigned by IANA to flcrs (Symantec Fingerprint Lookup and Container Reference Service).

Is port 5638 TCP or UDP?

Port 5638 is registered for TCP.

Is it safe to open port 5638?

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. Container and orchestration APIs give full control of hosts: require mutual TLS and RBAC.

How do I check if port 5638 is open?

On Linux run "ss -ltnup 'sport = :5638'", on macOS "lsof -nP -i :5638", and on Windows "netstat -ano | findstr :5638" to see the local process. From another machine, "nmap -p 5638 <host>" shows whether it is reachable.

05 Related
:2375 Docker API (HTTP) tcp · critical risk :2376 Docker API (TLS) tcp · high risk :6443 Kubernetes API tcp · udp · high risk :10250 Kubelet API tcp · critical risk :2379 etcd tcp · critical risk :8500 Consul tcp · udp · high risk :4505 SaltStack tcp · critical risk :9000 PHP-FPM / SonarQube / Portainer tcp · udp · high risk

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