Port 5356Microsoft Small Business

TCP and UDP port 5356 is assigned to Microsoft Small Business, but no common deployment is documented.

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

also known as ms-smlbiz

Technical Details

what runs on :5356

Microsoft Small Business is registered on port :5356 over tcp and udp to Gopikrishna Sandra, assigned February 2005. 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 :5356

this machine

# linux
sudo ss -tulpn 'sport = :5356'

# macos / bsd
sudo lsof -nP -i :5356

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :5356

another host

nmap -sV -p T:5356 <host>
sudo nmap -sU -sV -p U:5356 <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 :5356

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 :5356 yet

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

Record

iana registry entry

port: :5356
service: Microsoft Small Business
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: IANA assigns TCP and UDP port 5356 to Microsoft Small Business (ms-smlbiz), registered to Gopikrishna Sandra in 2005. No well-established public protocol or common listener is known for this assignment.
lookups: 0rank 993
added: 2026-10-07
updated: 2026-10-07
references: IANA service name registry — port 5356

Something wrong?

This record is maintained by the engineers who use port 5356. 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 2026-10-07.

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 :5356, by lookups.

port	service	proto	category	risk	views
:5351	NAT-PMP	TCPUDP	Security	caution	19.6k
:5357	WSDAPI	TCPUDP	Web Services	caution	19.2k
:5353	Multicast DNS	UDP	Network Services	safe	13.4k
:5402	MFTP Protocol	TCPUDP	File Transfer	caution	11.0k
:5355	LLMNR	TCPUDP	Security	caution	10.8k
:5298	XMPP Link-Local / Serverless Messaging	TCPUDP	Network Services	caution	9.5k
:5405	NetSupport Manager	TCPUDP	Remote Access	caution	9.3k
:5358	WSDAPI Secure Channel	TCPUDP	Network Services	caution	9.1k

risk mix of the 8 listed

safe13%
caution88%

0 of 8 encrypted

Port :5356Microsoft Small Business

Technical Details

Security Information

Related Ports

Port 5356Microsoft Small Business