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Port 3722 (xserveraid)

IANA assigns port 3722 to xserveraid: Xserve RAID.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
xserveraid TCP Xserve RAID Bob Bradley -
xserveraid UDP Xserve RAID Bob Bradley -

Registry dates for this port: registered 2003-03.

Check what is listening on port 3722

Linux: is anything listening on TCP 3722?
sudo ss -tlnp 'sport = :3722'
Linux: UDP 3722
sudo ss -ulnp 'sport = :3722'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3722
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3722 '
Windows (Command Prompt)
netstat -ano | findstr :3722
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3722 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3722
From Windows
Test-NetConnection HOST -Port 3722
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3722

Block port 3722 in the firewall

ufw
sudo ufw deny 3722/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3722 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3722 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3722' -Direction Inbound -Protocol TCP -LocalPort 3722 -Action Block
ufw
sudo ufw deny 3722/udp
iptables
sudo iptables -A INPUT -p udp --dport 3722 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3722 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3722' -Direction Inbound -Protocol UDP -LocalPort 3722 -Action Block

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