Port 19540Silex SXUPTP

TCP and UDP port 19540 is used by Silex's proprietary SXUPTP protocol for networked USB device servers.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 5/10
lookups: 0

also known as Silex USB over IP

Technical Details

what runs on :19540

SXUPTP is a proprietary Silex protocol for communicating with networked USB devices. IANA registers it on both TCP and UDP port 19540; the wire format and the precise division of work between the transports are vendor-specific rather than publicly standardized. It is used with Silex USB device servers and SX Virtual Link software, not as a general-purpose USB-over-IP standard.

Security Information

exposure of :19540

risk score

5/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

network services averages 2.6 across 1,930 ports — this one sits 2.4 above.

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

A reachable SXUPTP service may provide a path to use USB devices attached to the server, so exposure can have consequences beyond ordinary network service discovery. Keep it on trusted networks and restrict access with firewall rules; do not assume the proprietary protocol encrypts traffic or provides strong authentication.

Record

iana registry entry

port: :19540
service: Silex SXUPTP
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 5/10caution
category: Network Services
usage: SXUPTP is associated with Silex USB device servers and the SX Virtual Link client, which lets a computer access USB devices connected to a networked server. Engineers are most likely to encounter it on a local network where those products are installed.
lookups: 0rank 993
added: 2026-10-18
updated: 2026-10-18
references: IANA service name registry — port 19540

Something wrong?

This record is maintained by the engineers who use port 19540. 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 2026-10-18.

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

all 1,930 in network services →

the 8 most looked-up other ports in network services — 1,930 ports carry that label.

port	service	proto	category	risk	views
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
:6543	Jetnet	UDP	Network Services	caution	65.3k
:5938	TeamViewer	TCPUDP	Remote Access	caution	65.0k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3233	WhiskerControl Protocol	TCPUDP	Network Services	caution	61.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :19540Silex SXUPTP

Technical Details

Security Information

Related Ports

Port 19540Silex SXUPTP