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// Other services

Port 1335: Digital Notary Protocol

Port 1335 is assigned by IANA to digital-notary (Digital Notary Protocol).

1335

How digital-notary works

Other services
client:1335digital-notaryresponse client:1335digital-notaryresponse

The client sends a request to port 1335 and the digital-notary 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 1335 dangerous?

We have no specific security note for port 1335. 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 1335

ServicePortTransportDescriptionReferenceUpdated
digital-notary 1335 TCP, UDP Digital Notary Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1335, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1335'      # process listening on 1335
sudo lsof -nP -i :1335

macOS

sudo lsof -nP -i :1335

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1335 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1335
netstat -ano | findstr :1335

From another machine

nmap -p 1335 -sV <host>
sudo nmap -sU -p 1335 <host>
nc -zv <host> 1335

Block it in the firewall

sudo ufw deny 1335/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1335" -Direction Inbound -LocalPort 1335 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1335 used for?

Port 1335 is assigned by IANA to digital-notary (Digital Notary Protocol).

Is port 1335 TCP or UDP?

Port 1335 is registered for TCP and UDP.

Is it safe to open port 1335?

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 1335 is open?

On Linux run "ss -ltnup 'sport = :1335'", on macOS "lsof -nP -i :1335", and on Windows "netstat -ano | findstr :1335" to see the local process. From another machine, "nmap -p 1335 <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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