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Port 3834 (spectardata)

IANA assigns port 3834 to spectardata: Spectar Data Stream Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
spectardata TCP Spectar Data Stream Service - -
spectardata UDP Spectar Data Stream Service - -

Check what is listening on port 3834

Linux: is anything listening on TCP 3834?
sudo ss -tlnp 'sport = :3834'
Linux: UDP 3834
sudo ss -ulnp 'sport = :3834'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3834
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3834 '
Windows (Command Prompt)
netstat -ano | findstr :3834
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3834 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3834
From Windows
Test-NetConnection HOST -Port 3834
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3834

Block port 3834 in the firewall

ufw
sudo ufw deny 3834/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3834 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3834 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3834' -Direction Inbound -Protocol TCP -LocalPort 3834 -Action Block
ufw
sudo ufw deny 3834/udp
iptables
sudo iptables -A INPUT -p udp --dport 3834 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3834 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3834' -Direction Inbound -Protocol UDP -LocalPort 3834 -Action Block

Related ports

3832xxnetserver3833aipn-auth3835spectardb3836markem-dcp

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