Port 1901Fujitsu ICL Terminal Emulator Program A

Port 1901 is assigned to Fujitsu ICL Terminal Emulator Program A over TCP and UDP.

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

also known as fjicl-tep-a

Technical Details

what runs on :1901

no technical write-up for :1901 yet

the handshake, the implementations you meet in the wild, the flags that matter. we have the registry entry — the detail comes from the engineers who run it.

add technical details

Security Information

exposure of :1901

risk score

1/ 10safe

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

remote access averages 4.0 across 115 ports — this one sits 3.0 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

no security notes recorded for :1901 yet

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

Record

iana registry entry

port: :1901
service: Fujitsu ICL Terminal Emulator Program A
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Remote Access
usage: IANA assigns TCP and UDP port 1901 to Fujitsu ICL Terminal Emulator Program A. The assignment is registered to Bob Lyon; public deployment details are not recorded.
lookups: 0rank 994
added: 2026-08-20
updated: 2026-08-20
references: IANA service name registry — port 1901

Something wrong?

This record is maintained by the engineers who use port 1901. 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 2026-08-20.

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 115 in remote access →

the 8 most looked-up other ports in remote access — 115 ports carry that label.

port	service	proto	category	risk	views
:8000	Intel Remote Desktop / Alternate HTTP Port	TCP	Web Services	safe	84.3k
:8888	D2GS Admin Console	TCP	Remote Access	caution	83.7k
:8881	Atlasz Secure Server	TCP	Web Services	caution	67.6k
:5938	TeamViewer	TCPUDP	Remote Access	caution	65.0k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:8008	IBM HTTP Server Admin	TCP	Web Services	caution	58.3k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:23	Telnet	TCP	Remote Access	caution	34.8k

risk mix of the 8 listed

safe13%
caution88%

0 of 8 encrypted

Port :1901Fujitsu ICL Terminal Emulator Program A

Technical Details

Security Information

Related Ports

Port 1901Fujitsu ICL Terminal Emulator Program A