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Port 4067 (idp)

IANA assigns port 4067 to idp: Information Distribution Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
idp TCP Information Distribution Protocol Michaela Vanderveen -
idp UDP Information Distribution Protocol Michaela Vanderveen -

Registry dates for this port: registered 2007-02.

Check what is listening on port 4067

Linux: is anything listening on TCP 4067?
sudo ss -tlnp 'sport = :4067'
Linux: UDP 4067
sudo ss -ulnp 'sport = :4067'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4067
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4067 '
Windows (Command Prompt)
netstat -ano | findstr :4067
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4067 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4067
From Windows
Test-NetConnection HOST -Port 4067
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4067

Block port 4067 in the firewall

ufw
sudo ufw deny 4067/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4067 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4067 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4067' -Direction Inbound -Protocol TCP -LocalPort 4067 -Action Block
ufw
sudo ufw deny 4067/udp
iptables
sudo iptables -A INPUT -p udp --dport 4067 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4067 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4067' -Direction Inbound -Protocol UDP -LocalPort 4067 -Action Block

Related ports

4065avanti-cdp, avanti_cdp4066pmas4068ipfltbcst4069minger

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