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Port 667 (disclose)

IANA assigns port 667 to disclose: campaign contribution disclosures - SDR Technologies.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
disclose TCP campaign contribution disclosures - SDR Technologies Jim Dixon -
disclose UDP campaign contribution disclosures - SDR Technologies Jim Dixon -

Check what is listening on port 667

Linux: is anything listening on TCP 667?
sudo ss -tlnp 'sport = :667'
Linux: UDP 667
sudo ss -ulnp 'sport = :667'
Linux / macOS: which process owns the port
sudo lsof -nP -i :667
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':667 '
Windows (Command Prompt)
netstat -ano | findstr :667
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 667 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 667
From Windows
Test-NetConnection HOST -Port 667
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 667

Block port 667 in the firewall

ufw
sudo ufw deny 667/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 667 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 667 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 667' -Direction Inbound -Protocol TCP -LocalPort 667 -Action Block
ufw
sudo ufw deny 667/udp
iptables
sudo iptables -A INPUT -p udp --dport 667 -j DROP
nftables
sudo nft add rule inet filter input udp dport 667 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 667' -Direction Inbound -Protocol UDP -LocalPort 667 -Action Block

Related ports

665sun-dr666doom668mecomm669meregister

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