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Port 608 (sift-uft)

IANA assigns port 608 to sift-uft: Sender-Initiated/Unsolicited File Transfer.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sift-uft TCP Sender-Initiated/Unsolicited File Transfer Rick Troth -
sift-uft UDP Sender-Initiated/Unsolicited File Transfer Rick Troth -

Check what is listening on port 608

Linux: is anything listening on TCP 608?
sudo ss -tlnp 'sport = :608'
Linux: UDP 608
sudo ss -ulnp 'sport = :608'
Linux / macOS: which process owns the port
sudo lsof -nP -i :608
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':608 '
Windows (Command Prompt)
netstat -ano | findstr :608
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 608 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 608
From Windows
Test-NetConnection HOST -Port 608
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 608

Block port 608 in the firewall

ufw
sudo ufw deny 608/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 608 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 608 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 608' -Direction Inbound -Protocol TCP -LocalPort 608 -Action Block
ufw
sudo ufw deny 608/udp
iptables
sudo iptables -A INPUT -p udp --dport 608 -j DROP
nftables
sudo nft add rule inet filter input udp dport 608 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 608' -Direction Inbound -Protocol UDP -LocalPort 608 -Action Block

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.