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Port 3835 (spectardb)

IANA assigns port 3835 to spectardb: Spectar Database Rights Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
spectardb TCP Spectar Database Rights Service Jan Rutger Voorhorst -
spectardb UDP Spectar Database Rights Service Jan Rutger Voorhorst -

Registry dates for this port: registered 2006-10.

Check what is listening on port 3835

Linux: is anything listening on TCP 3835?
sudo ss -tlnp 'sport = :3835'
Linux: UDP 3835
sudo ss -ulnp 'sport = :3835'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3835
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3835 '
Windows (Command Prompt)
netstat -ano | findstr :3835
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3835 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3835
From Windows
Test-NetConnection HOST -Port 3835
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3835

Block port 3835 in the firewall

ufw
sudo ufw deny 3835/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3835 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3835 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3835' -Direction Inbound -Protocol TCP -LocalPort 3835 -Action Block
ufw
sudo ufw deny 3835/udp
iptables
sudo iptables -A INPUT -p udp --dport 3835 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3835 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3835' -Direction Inbound -Protocol UDP -LocalPort 3835 -Action Block

Related ports

3833aipn-auth3834spectardata3836markem-dcp3837mkm-discovery

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