CyberHunter
Local dataset, no network
// Other services

Port 3637: Customer Service Port

Port 3637 is assigned by IANA to scservp (Customer Service Port).

3637

How scservp works

Other services
client:3637scservpresponse client:3637scservpresponse

The client sends a request to port 3637 and the scservp 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 3637 dangerous?

We have no specific security note for port 3637. 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 3637

ServicePortTransportDescriptionReferenceUpdated
scservp 3637 TCP, UDP Customer Service Port - 2002-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 3637, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3637'      # process listening on 3637
sudo lsof -nP -i :3637

macOS

sudo lsof -nP -i :3637

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3637 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3637
netstat -ano | findstr :3637

From another machine

nmap -p 3637 -sV <host>
sudo nmap -sU -p 3637 <host>
nc -zv <host> 3637

Block it in the firewall

sudo ufw deny 3637/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3637" -Direction Inbound -LocalPort 3637 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3637 used for?

Port 3637 is assigned by IANA to scservp (Customer Service Port).

Is port 3637 TCP or UDP?

Port 3637 is registered for TCP and UDP.

Is it safe to open port 3637?

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 3637 is open?

On Linux run "ss -ltnup 'sport = :3637'", on macOS "lsof -nP -i :3637", and on Windows "netstat -ano | findstr :3637" to see the local process. From another machine, "nmap -p 3637 <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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