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Port 3837 (mkm-discovery)

IANA assigns port 3837 to mkm-discovery: MARKEM Auto-Discovery.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mkm-discovery TCP MARKEM Auto-Discovery Vadym Kargin -
mkm-discovery UDP MARKEM Auto-Discovery Vadym Kargin -

Registry dates for this port: registered 2005-08.

Check what is listening on port 3837

Linux: is anything listening on TCP 3837?
sudo ss -tlnp 'sport = :3837'
Linux: UDP 3837
sudo ss -ulnp 'sport = :3837'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3837
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3837 '
Windows (Command Prompt)
netstat -ano | findstr :3837
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3837 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3837
From Windows
Test-NetConnection HOST -Port 3837
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3837

Block port 3837 in the firewall

ufw
sudo ufw deny 3837/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3837 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3837 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3837' -Direction Inbound -Protocol TCP -LocalPort 3837 -Action Block
ufw
sudo ufw deny 3837/udp
iptables
sudo iptables -A INPUT -p udp --dport 3837 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3837 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3837' -Direction Inbound -Protocol UDP -LocalPort 3837 -Action Block

Related ports

3835spectardb3836markem-dcp3838sos3839amx-rms

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