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Port 26263 (k3software-cli)

IANA assigns port 26263 to k3software-cli: K3 Software-Client.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
k3software-cli TCP K3 Software-Client Jim Baldridge -
k3software-cli UDP K3 Software-Client Jim Baldridge -

Check what is listening on port 26263

Linux: is anything listening on TCP 26263?
sudo ss -tlnp 'sport = :26263'
Linux: UDP 26263
sudo ss -ulnp 'sport = :26263'
Linux / macOS: which process owns the port
sudo lsof -nP -i :26263
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':26263 '
Windows (Command Prompt)
netstat -ano | findstr :26263
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 26263 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 26263
From Windows
Test-NetConnection HOST -Port 26263
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 26263

Block port 26263 in the firewall

ufw
sudo ufw deny 26263/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 26263 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 26263 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 26263' -Direction Inbound -Protocol TCP -LocalPort 26263 -Action Block
ufw
sudo ufw deny 26263/udp
iptables
sudo iptables -A INPUT -p udp --dport 26263 -j DROP
nftables
sudo nft add rule inet filter input udp dport 26263 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 26263' -Direction Inbound -Protocol UDP -LocalPort 26263 -Action Block

Related ports

26261ezmeeting26262k3software-svr26486exoline-tcp, exoline-udp26487exoconfig

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