CyberHunter
Local dataset, no network
// Other services

Port 3776: Device Provisioning Port

Port 3776 is assigned by IANA to dvcprov-port (Device Provisioning Port).

3776

How dvcprov-port works

Other services
client:3776dvcprov-portresponse client:3776dvcprov-portresponse

The client sends a request to port 3776 and the dvcprov-port 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 3776 dangerous?

We have no specific security note for port 3776. 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 3776

ServicePortTransportDescriptionReferenceUpdated
dvcprov-port 3776 TCP, UDP Device Provisioning Port - 2003-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 3776, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3776'      # process listening on 3776
sudo lsof -nP -i :3776

macOS

sudo lsof -nP -i :3776

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3776 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3776
netstat -ano | findstr :3776

From another machine

nmap -p 3776 -sV <host>
sudo nmap -sU -p 3776 <host>
nc -zv <host> 3776

Block it in the firewall

sudo ufw deny 3776/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3776" -Direction Inbound -LocalPort 3776 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3776 used for?

Port 3776 is assigned by IANA to dvcprov-port (Device Provisioning Port).

Is port 3776 TCP or UDP?

Port 3776 is registered for TCP and UDP.

Is it safe to open port 3776?

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 3776 is open?

On Linux run "ss -ltnup 'sport = :3776'", on macOS "lsof -nP -i :3776", and on Windows "netstat -ano | findstr :3776" to see the local process. From another machine, "nmap -p 3776 <host>" shows whether it is reachable.

05 Related
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