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// File transfer & sharing

Port 4971: BackUp and Restore Program

Port 4971 is assigned by IANA to burp (BackUp and Restore Program).

4971

How burp works

File transfer & sharing
client:49711/32/33/3burp client:49711/32/33/3burp

Files are sent over port 4971 in pieces and reassembled on the other side.

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
File transfer & sharing
01 Security

Is port 4971 dangerous?

We have no specific security note for port 4971. Its risk depends on the program actually listening on it. General advice for file transfer & sharing services:

  • Prefer encrypted protocols (SFTP, FTPS, SMB 3 with encryption).
  • Disable anonymous access and restrict shares or exports to known hosts.
  • Never publish file sharing protocols to the Internet.
02 Registry

IANA registry entries for port 4971

ServicePortTransportDescriptionReferenceUpdated
burp 4971 TCP BackUp and Restore Program - 2017-08-23
-4971-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4971, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4971'      # process listening on 4971
sudo lsof -nP -i :4971

macOS

sudo lsof -nP -i :4971

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4971 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4971
netstat -ano | findstr :4971

From another machine

nmap -p 4971 -sV <host>
nc -zv <host> 4971

Block it in the firewall

sudo ufw deny 4971/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4971" -Direction Inbound -LocalPort 4971 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4971 used for?

Port 4971 is assigned by IANA to burp (BackUp and Restore Program).

Is port 4971 TCP or UDP?

Port 4971 is registered for TCP.

Is it safe to open port 4971?

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. Prefer encrypted protocols (SFTP, FTPS, SMB 3 with encryption).

How do I check if port 4971 is open?

On Linux run "ss -ltnup 'sport = :4971'", on macOS "lsof -nP -i :4971", and on Windows "netstat -ano | findstr :4971" to see the local process. From another machine, "nmap -p 4971 <host>" shows whether it is reachable.

05 Related
:445 SMB tcp · udp · critical risk :21 FTP tcp · udp · sctp · high risk :139 NetBIOS Session tcp · udp · high risk :69 TFTP udp · tcp · high risk :2049 NFS tcp · udp · sctp · high risk :873 rsync tcp · udp · high risk :20 File Transfer [Default Data] tcp · udp · sctp :115 Simple File Transfer Protocol tcp · udp

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