Port 2138UNBIND-CLUSTER

An obscure TCP/UDP service assignment named UNBIND-CLUSTER, registered to Francois Harvey.

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

Technical Details

what runs on :2138

UNBIND-CLUSTER is registered on port :2138 over tcp and udp to Francois Harvey. 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 found open rarely. What's listening is often not the registered service, so check before you assume.

find what's listening on :2138

this machine

# linux
sudo ss -tulpn 'sport = :2138'

# macos / bsd
sudo lsof -nP -i :2138

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :2138

another host

nmap -sV -p T:2138 <host>
sudo nmap -sU -sV -p U:2138 <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 :2138

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 :2138 yet

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

Record

iana registry entry

port: :2138
service: UNBIND-CLUSTER
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: IANA assigns the name UNBIND-CLUSTER to both TCP port 2138 and UDP port 2138. The registry identifies Francois Harvey as the registrant but provides no further product or protocol details.
lookups: 0rank 993
added: 2026-09-02
updated: 2026-09-02
references: IANA service name registry — port 2138

Something wrong?

This record is maintained by the engineers who use port 2138. 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 2026-09-02.

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 :2138, by lookups.

port	service	proto	category	risk	views
:2105	eklogin Kerberos Remote Login	TCPUDP	Security	safe	22.1k
:2083	cPanel SSL	TCPtls	Web Services	safe	20.3k
:2105	Zephyr Notification Service (hm-serv)	TCPUDP	Network Services	caution	19.0k
:2082	Infowave Mobility	TCP	Network Services	caution	17.7k
:2087	WHM SSL	TCPtls	Web Services	caution	17.7k
:2096	cPanel SSL Webmail	TCPtls	Web Services	safe	17.4k
:2103	Zephyr Notification Service	TCPUDP	Network Services	caution	15.8k
:2105	IBM MiniPay	TCPUDP	System	caution	15.7k

risk mix of the 8 listed

safe38%
caution63%

3 of 8 encrypted

Port :2138UNBIND-CLUSTER

Technical Details

Security Information

Related Ports

Port 2138UNBIND-CLUSTER