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// File transfer & sharing

Port 4071: Automatically Incremental Backup

Port 4071 is assigned by IANA to aibkup (Automatically Incremental Backup).

4071

How aibkup works

File transfer & sharing
client:40711/32/33/3aibkup client:40711/32/33/3aibkup

Files are sent over port 4071 in pieces and reassembled on the other side.

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
File transfer & sharing
01 Security

Is port 4071 dangerous?

We have no specific security note for port 4071. 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 4071

ServicePortTransportDescriptionReferenceUpdated
aibkup 4071 TCP, UDP Automatically Incremental Backup - 2007-07-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 4071, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4071'      # process listening on 4071
sudo lsof -nP -i :4071

macOS

sudo lsof -nP -i :4071

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4071 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4071
netstat -ano | findstr :4071

From another machine

nmap -p 4071 -sV <host>
sudo nmap -sU -p 4071 <host>
nc -zv <host> 4071

Block it in the firewall

sudo ufw deny 4071/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4071" -Direction Inbound -LocalPort 4071 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4071 used for?

Port 4071 is assigned by IANA to aibkup (Automatically Incremental Backup).

Is port 4071 TCP or UDP?

Port 4071 is registered for TCP and UDP.

Is it safe to open port 4071?

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 4071 is open?

On Linux run "ss -ltnup 'sport = :4071'", on macOS "lsof -nP -i :4071", and on Windows "netstat -ano | findstr :4071" to see the local process. From another machine, "nmap -p 4071 <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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