Port 26263K3 Software-Client

TCP/UDP 26263 is assigned to K3 Software-Client, with no widely documented deployment or protocol behavior.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

Technical Details

what runs on :26263

K3 Software-Client is registered on port :26263 over tcp and udp to Jim Baldridge. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is never observed open, so if it's open on your network it's more likely a custom or misconfigured service than the registered one.

find what's listening on :26263

this machine

# linux
sudo ss -tulpn 'sport = :26263'

# macos / bsd
sudo lsof -nP -i :26263

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :26263

another host

nmap -sV -p T:26263 <host>
sudo nmap -sU -sV -p U:26263 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :26263

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

no security notes recorded for :26263 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :26263
service: K3 Software-Client
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: IANA lists K3 Software-Client on TCP and UDP port 26263, registered to Jim Baldridge. No widely documented software, protocol behavior, or common deployment is known; Nmap's internet-wide scan data has not observed it open.
lookups: 0rank 993
added: 2026-10-19
updated: 2026-10-19
references: IANA service name registry — port 26263

Something wrong?

This record is maintained by the engineers who use port 26263. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-19.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

browse categories →

ports registered around :26263, by lookups.

port	service	proto	category	risk
:26208	wnn6-ds	TCPUDP	—	safe
:26257	CockroachDB	TCPtls	Databases	risk
:26260	eZproxy	TCPUDP	—	safe
:26261	eZmeeting	TCPUDP	—	safe
:26262	K3 Software-Server	TCPUDP	—	safe

risk mix of the 5 listed

safe80%
risk20%

1 of 5 encrypted

Port :26263K3 Software-Client

Technical Details

Security Information

Related Ports

Port 26263K3 Software-Client