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Port 4400 (ds-srv)

IANA assigns port 4400 to ds-srv: ASIGRA Services.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ds-srv TCP ASIGRA Services David Farajun -
ds-srv UDP ASIGRA Services David Farajun -

Registry dates for this port: registered 2004-11.

Check what is listening on port 4400

Linux: is anything listening on TCP 4400?
sudo ss -tlnp 'sport = :4400'
Linux: UDP 4400
sudo ss -ulnp 'sport = :4400'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4400
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4400 '
Windows (Command Prompt)
netstat -ano | findstr :4400
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4400 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4400
From Windows
Test-NetConnection HOST -Port 4400
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4400

Block port 4400 in the firewall

ufw
sudo ufw deny 4400/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4400 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4400 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4400' -Direction Inbound -Protocol TCP -LocalPort 4400 -Action Block
ufw
sudo ufw deny 4400/udp
iptables
sudo iptables -A INPUT -p udp --dport 4400 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4400 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4400' -Direction Inbound -Protocol UDP -LocalPort 4400 -Action Block

Related ports

4395omnivisionesx4396fly4401ds-srvr4402ds-clnt

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