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Port 6701 (kti-icad-srvr)

IANA assigns port 6701 to kti-icad-srvr: KTI/ICAD Nameserver.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
kti-icad-srvr TCP KTI/ICAD Nameserver Stanley Knutson -
kti-icad-srvr UDP KTI/ICAD Nameserver Stanley Knutson -

Check what is listening on port 6701

Linux: is anything listening on TCP 6701?
sudo ss -tlnp 'sport = :6701'
Linux: UDP 6701
sudo ss -ulnp 'sport = :6701'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6701
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6701 '
Windows (Command Prompt)
netstat -ano | findstr :6701
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6701 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6701
From Windows
Test-NetConnection HOST -Port 6701
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6701

Block port 6701 in the firewall

ufw
sudo ufw deny 6701/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6701 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6701 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6701' -Direction Inbound -Protocol TCP -LocalPort 6701 -Action Block
ufw
sudo ufw deny 6701/udp
iptables
sudo iptables -A INPUT -p udp --dport 6701 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6701 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6701' -Direction Inbound -Protocol UDP -LocalPort 6701 -Action Block

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