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Port 910 (kink)

IANA assigns port 910 to kink: Kerberized Internet Negotiation of Keys (KINK).

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
kink TCP Kerberized Internet Negotiation of Keys (KINK) - RFC 4430
kink UDP Kerberized Internet Negotiation of Keys (KINK) - RFC 4430

Check what is listening on port 910

Linux: is anything listening on TCP 910?
sudo ss -tlnp 'sport = :910'
Linux: UDP 910
sudo ss -ulnp 'sport = :910'
Linux / macOS: which process owns the port
sudo lsof -nP -i :910
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':910 '
Windows (Command Prompt)
netstat -ano | findstr :910
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 910 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 910
From Windows
Test-NetConnection HOST -Port 910
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 910

Block port 910 in the firewall

ufw
sudo ufw deny 910/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 910 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 910 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 910' -Direction Inbound -Protocol TCP -LocalPort 910 -Action Block
ufw
sudo ufw deny 910/udp
iptables
sudo iptables -A INPUT -p udp --dport 910 -j DROP
nftables
sudo nft add rule inet filter input udp dport 910 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 910' -Direction Inbound -Protocol UDP -LocalPort 910 -Action Block

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