Port 4443Pharos

Pharos is an obscure TeleConsult service assigned to TCP and UDP port 4443.

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

Technical Details

what runs on :4443

Pharos is registered on port :4443 over tcp and udp to TeleConsult. 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.

IANA has recorded this port being used for something it was not assigned for.

find what's listening on :4443

this machine

# linux
sudo ss -tulpn 'sport = :4443'

# macos / bsd
sudo lsof -nP -i :4443

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :4443

another host

nmap -sV -p T:4443 <host>
sudo nmap -sU -sV -p U:4443 <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 :4443

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 :4443 yet

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

Record

iana registry entry

port: :4443
service: Pharos
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: Pharos is the IANA-registered service name for TCP and UDP port 4443, assigned to TeleConsult. The registry provides no protocol or deployment details, and internet-wide scans observe it only rarely.
lookups: 0rank 993
added: 2026-08-23
updated: 2026-08-23
references: IANA service name registry — port 4443

Something wrong?

This record is maintained by the engineers who use port 4443. 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 2026-08-23.

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 :4443, by lookups.

port	service	proto	category	risk	views
:4500	IPSec NAT Traversal	UDPtls	Security	caution	15.8k
:4433	Axence nVision	TCP	Security	caution	8.9k
:4394	American Printware Discovery	UDP	Network Services	safe	0
:4447	N1-RMGMT	TCPUDP	—	safe	0
:4404	Asigra DS-System Monitoring/Management	TCPUDP	System	safe	0
:4449	PrivateWire	TCPUDP	—	safe	0
:4430	REAL SQL Server	TCPUDP	Databases	safe	0
:4444	Kerberos 524	TCPUDP	Security	caution	0

risk mix of the 8 listed

safe63%
caution38%

1 of 8 encrypted

Port :4443Pharos

Technical Details

Security Information

Related Ports

Port 4443Pharos