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Port 32635 (sec-ntb-clnt)

IANA assigns port 32635 to sec-ntb-clnt: SecureNotebook-CLNT.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sec-ntb-clnt TCP SecureNotebook-CLNT Eric Cantineau -
sec-ntb-clnt UDP SecureNotebook-CLNT Eric Cantineau -

Registry dates for this port: registered 2004-11.

Check what is listening on port 32635

Linux: is anything listening on TCP 32635?
sudo ss -tlnp 'sport = :32635'
Linux: UDP 32635
sudo ss -ulnp 'sport = :32635'
Linux / macOS: which process owns the port
sudo lsof -nP -i :32635
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':32635 '
Windows (Command Prompt)
netstat -ano | findstr :32635
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 32635 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 32635
From Windows
Test-NetConnection HOST -Port 32635
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 32635

Block port 32635 in the firewall

ufw
sudo ufw deny 32635/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 32635 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 32635 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 32635' -Direction Inbound -Protocol TCP -LocalPort 32635 -Action Block
ufw
sudo ufw deny 32635/udp
iptables
sudo iptables -A INPUT -p udp --dport 32635 -j DROP
nftables
sudo nft add rule inet filter input udp dport 32635 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 32635' -Direction Inbound -Protocol UDP -LocalPort 32635 -Action Block

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