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Port 3768 (rblcheckd)

IANA assigns port 3768 to rblcheckd: rblcheckd server daemon.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rblcheckd TCP rblcheckd server daemon Sabri Berisha -
rblcheckd UDP rblcheckd server daemon Sabri Berisha -

Registry dates for this port: registered 2003-06.

Check what is listening on port 3768

Linux: is anything listening on TCP 3768?
sudo ss -tlnp 'sport = :3768'
Linux: UDP 3768
sudo ss -ulnp 'sport = :3768'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3768
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3768 '
Windows (Command Prompt)
netstat -ano | findstr :3768
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3768 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3768
From Windows
Test-NetConnection HOST -Port 3768
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3768

Block port 3768 in the firewall

ufw
sudo ufw deny 3768/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3768 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3768 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3768' -Direction Inbound -Protocol TCP -LocalPort 3768 -Action Block
ufw
sudo ufw deny 3768/udp
iptables
sudo iptables -A INPUT -p udp --dport 3768 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3768 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3768' -Direction Inbound -Protocol UDP -LocalPort 3768 -Action Block

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