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// File transfer & sharing

Port 608: Sender-Initiated/Unsolicited File Transfer

Port 608 is assigned by IANA to sift-uft (Sender-Initiated/Unsolicited File Transfer).

608

How sift-uft works

File transfer & sharing
client:6081/32/33/3sift-uft client:6081/32/33/3sift-uft

Files are sent over port 608 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
Well-known (0-1023)
Category
File transfer & sharing
01 Security

Is port 608 dangerous?

We have no specific security note for port 608. 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 608

ServicePortTransportDescriptionReferenceUpdated
sift-uft 608 TCP, UDP Sender-Initiated/Unsolicited File Transfer - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 608, and is it reachable?

Linux

sudo ss -ltnup 'sport = :608'      # process listening on 608
sudo lsof -nP -i :608

macOS

sudo lsof -nP -i :608

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 608 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 608
netstat -ano | findstr :608

From another machine

nmap -p 608 -sV <host>
sudo nmap -sU -p 608 <host>
nc -zv <host> 608

Block it in the firewall

sudo ufw deny 608/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 608" -Direction Inbound -LocalPort 608 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 608 used for?

Port 608 is assigned by IANA to sift-uft (Sender-Initiated/Unsolicited File Transfer).

Is port 608 TCP or UDP?

Port 608 is registered for TCP and UDP.

Is it safe to open port 608?

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 608 is open?

On Linux run "ss -ltnup 'sport = :608'", on macOS "lsof -nP -i :608", and on Windows "netstat -ano | findstr :608" to see the local process. From another machine, "nmap -p 608 <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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