CyberHunter
Local dataset, no network
// Other services

Port 74: Remote Job Service

Port 74 is assigned by IANA to netrjs-4 (Remote Job Service).

74

How netrjs-4 works

Other services
client:74netrjs-4response client:74netrjs-4response

The client sends a request to port 74 and the netrjs-4 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 74 dangerous?

We have no specific security note for port 74. 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 74

ServicePortTransportDescriptionReferenceUpdated
netrjs-4 74 TCP, UDP Remote Job Service - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 74, and is it reachable?

Linux

sudo ss -ltnup 'sport = :74'      # process listening on 74
sudo lsof -nP -i :74

macOS

sudo lsof -nP -i :74

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 74 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 74
netstat -ano | findstr :74

From another machine

nmap -p 74 -sV <host>
sudo nmap -sU -p 74 <host>
nc -zv <host> 74

Block it in the firewall

sudo ufw deny 74/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 74" -Direction Inbound -LocalPort 74 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 74 used for?

Port 74 is assigned by IANA to netrjs-4 (Remote Job Service).

Is port 74 TCP or UDP?

Port 74 is registered for TCP and UDP.

Is it safe to open port 74?

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 74 is open?

On Linux run "ss -ltnup 'sport = :74'", on macOS "lsof -nP -i :74", and on Windows "netstat -ano | findstr :74" to see the local process. From another machine, "nmap -p 74 <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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