Port 5859WHEREHOO

WHEREHOO is an obscure TCP/UDP service assignment with little documented or observed public deployment.

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

Technical Details

what runs on :5859

WHEREHOO is registered on port :5859 over tcp and udp to Jim Youll. 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 :5859

this machine

# linux
sudo ss -tulpn 'sport = :5859'

# macos / bsd
sudo lsof -nP -i :5859

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :5859

another host

nmap -sV -p T:5859 <host>
sudo nmap -sU -sV -p U:5859 <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 :5859

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 :5859 yet

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

Record

iana registry entry

port: :5859
service: WHEREHOO
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: WHEREHOO is the IANA-assigned service name for TCP and UDP port 5859. The assignment is registered to Jim Youll, but no public protocol or product usage is documented here.
lookups: 0rank 993
added: 2026-09-08
updated: 2026-09-08
references: IANA service name registry — port 5859

Something wrong?

This record is maintained by the engineers who use port 5859. 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 2026-09-08.

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 :5859, by lookups.

port	service	proto	category	risk	views
:5800	VNC over HTTP	TCP	Web Services	caution	30.3k
:5814	HP Support Automation	TCPUDP	Remote Access	caution	14.8k
:5900	VNC Remote Desktop	TCPUDP	Remote Access	caution	14.2k
:5852	Adeona OpenDHT Client	TCP	Security	caution	9.3k
:5912	Tidal Scheduler Agent	TCP	System	caution	8.5k
:5850	COMIT SE PCR	TCP	Network Services	caution	4.2k
:5904	Air-Ground SWIM	TCPUDPSCTP	Network Services	safe	0
:5910	Context Management	SCTP	System	safe	0

risk mix of the 8 listed

safe25%
caution75%

0 of 8 encrypted

Port :5859WHEREHOO

Technical Details

Security Information

Related Ports

Port 5859WHEREHOO