Port 1989MHSnet

MHSnet system traffic uses TCP and UDP port 1989 for an obscure messaging service.

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

also known as mshnet

1 other service is registered on port 1989. compare all 2 →

Technical Details

what runs on :1989

IANA registers MHSnet on both TCP and UDP port 1989. MHSnet uses the port for inter-node communication in its store-and-forward messaging and file-transfer system; the exact handshake, framing, and enabled transport depend on the implementation and version, and there is no modern operating-system default for this port. It is a historical protocol rather than SMTP, and deployments should not be expected to provide contemporary encryption by default.

Security Information

exposure of :1989

risk score

2/ 10safe

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

network services averages 2.6 across 1,702 ports — this one sits 0.6 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

MHSnet is rarely encountered on the modern public Internet, but an exposed historical node could disclose or relay messages and files and may contain unmaintained software. Keep it restricted to trusted peer systems or a private network, and do not assume that traffic or credentials are encrypted.

Record

iana registry entry

port: :1989
service: MHSnet
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: MHSnet is a historical Unix store-and-forward networking system used to exchange messages and files between sites, especially in Australian academic and research networks. A listener generally indicates MHSnet software or a gateway, not a generic mail server, and it is uncommon on today's Internet.
lookups: 0rank 993
added: 2026-09-20
updated: 2026-09-22
references: IANA service name registry — port 1989

Something wrong?

This record is maintained by the engineers who use port 1989. 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 2026-09-22.

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 1,702 in network services →

the 8 most looked-up other ports in network services — 1,702 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 :1989MHSnet

Technical Details

Security Information

Related Ports

Port 1989MHSnet