Port 4327Jaxer Web Protocol

Port 4327 is associated with Aptana Jaxer, a server-side JavaScript web application platform.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 2/10
lookups: 0

Technical Details

what runs on :4327

The IANA assignment is for the Jaxer Web Protocol on TCP and UDP port 4327. Jaxer was an application platform for running JavaScript on the server, and this port is associated with its web-serving stack, not ordinary browser HTTP. The protocol's wire format and routine UDP use are not well documented; do not assume that a listener speaks HTTP or that UDP is used just because it is registered.

Security Information

exposure of :4327

risk score

2/ 10safe

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

web services averages 3.1 across 191 ports — this one sits 1.1 below.

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

Treat a Jaxer listener as an application-backend service and keep it limited to the systems that need to reach it rather than exposing it directly to the internet. There is no well-established public attack profile for this obscure port, and the assigned protocol should not be assumed to provide encryption.

Record

iana registry entry

port: :4327
service: Jaxer Web Protocol
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Web Services
usage: Jaxer is a server-side JavaScript platform, and this assignment identifies its web protocol. If encountered, expect it in a Jaxer deployment rather than as a general-purpose web service; it has not been commonly observed open in internet-wide scans.
lookups: 0rank 993
added: 2026-10-04
updated: 2026-10-04
references: IANA service name registry — port 4327

Something wrong?

This record is maintained by the engineers who use port 4327. 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 2026-10-04.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

Related Ports

all 191 in web services →

the 8 most looked-up other ports in web services — 191 ports carry that label.

port	service	proto	category	risk	views
:8888	Sun Answerbook & Alt HTTP	TCP	Web Services	caution	123.9k
:8000	Intel Remote Desktop / Alternate HTTP Port	TCP	Web Services	safe	84.3k
:8888	NewsEDGE	TCPUDP	Web Services	caution	83.3k
:8888	HTTP Alternative Port	TCP	Web Services	caution	76.5k
:8888	GNUmp3d Streaming HTTP	TCP	Web Services	caution	76.3k
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
:8881	Atlasz Secure Server	TCP	Web Services	caution	67.6k
:80	HTTP	TCPUDP	Web Services	caution	67.3k

risk mix of the 8 listed

safe13%
caution88%

0 of 8 encrypted

Port :4327Jaxer Web Protocol

Technical Details

Security Information

Related Ports

Port 4327Jaxer Web Protocol