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// File transfer & sharing

Port 989: ftp protocol, data, over TLS/SSL

Port 989 is assigned by IANA to ftps-data (ftp protocol, data, over TLS/SSL).

989

How ftps-data works

File transfer & sharing
client:9891/32/33/3ftps-data? client:9891/32/33/3ftps-data?

Files are sent over port 989 in pieces and reassembled on the other side. Everything is encrypted: someone on the path only sees unreadable bytes.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
EncryptedTLS or built-in crypto
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
File transfer & sharing
01 Security

Is port 989 dangerous?

We have no specific security note for port 989. 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 989

ServicePortTransportDescriptionReferenceUpdated
ftps-data 989 TCP, UDP ftp protocol, data, over TLS/SSL - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 989, and is it reachable?

Linux

sudo ss -ltnup 'sport = :989'      # process listening on 989
sudo lsof -nP -i :989

macOS

sudo lsof -nP -i :989

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 989 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 989
netstat -ano | findstr :989

From another machine

nmap -p 989 -sV <host>
sudo nmap -sU -p 989 <host>
nc -zv <host> 989

Block it in the firewall

sudo ufw deny 989/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 989" -Direction Inbound -LocalPort 989 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 989 used for?

Port 989 is assigned by IANA to ftps-data (ftp protocol, data, over TLS/SSL).

Is port 989 TCP or UDP?

Port 989 is registered for TCP and UDP.

Is it safe to open port 989?

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 989 is open?

On Linux run "ss -ltnup 'sport = :989'", on macOS "lsof -nP -i :989", and on Windows "netstat -ano | findstr :989" to see the local process. From another machine, "nmap -p 989 <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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