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Port 3522 (nssocketport)

IANA assigns port 3522 to nssocketport: DO over NSSocketPort.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nssocketport TCP DO over NSSocketPort Douglas Davidson -
nssocketport UDP DO over NSSocketPort Douglas Davidson -

Registry dates for this port: registered 2002-06.

Check what is listening on port 3522

Linux: is anything listening on TCP 3522?
sudo ss -tlnp 'sport = :3522'
Linux: UDP 3522
sudo ss -ulnp 'sport = :3522'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3522
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3522 '
Windows (Command Prompt)
netstat -ano | findstr :3522
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3522 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3522
From Windows
Test-NetConnection HOST -Port 3522
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3522

Block port 3522 in the firewall

ufw
sudo ufw deny 3522/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3522 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3522 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3522' -Direction Inbound -Protocol TCP -LocalPort 3522 -Action Block
ufw
sudo ufw deny 3522/udp
iptables
sudo iptables -A INPUT -p udp --dport 3522 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3522 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3522' -Direction Inbound -Protocol UDP -LocalPort 3522 -Action Block

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