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Port 690 (vatp)

IANA assigns port 690 to vatp: Velneo Application Transfer Protocol.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
vatp TCP Velneo Application Transfer Protocol Velneo -
vatp UDP Velneo Application Transfer Protocol Velneo -

Registry dates for this port: last modified 2015-02-03.

Check what is listening on port 690

Linux: is anything listening on TCP 690?
sudo ss -tlnp 'sport = :690'
Linux: UDP 690
sudo ss -ulnp 'sport = :690'
Linux / macOS: which process owns the port
sudo lsof -nP -i :690
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':690 '
Windows (Command Prompt)
netstat -ano | findstr :690
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 690 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 690
From Windows
Test-NetConnection HOST -Port 690
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 690

Block port 690 in the firewall

ufw
sudo ufw deny 690/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 690 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 690 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 690' -Direction Inbound -Protocol TCP -LocalPort 690 -Action Block
ufw
sudo ufw deny 690/udp
iptables
sudo iptables -A INPUT -p udp --dport 690 -j DROP
nftables
sudo nft add rule inet filter input udp dport 690 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 690' -Direction Inbound -Protocol UDP -LocalPort 690 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.