Port 2065Data Link Switch Read Port Number

Port assigned for Data Link Switch Read traffic over TCP and UDP.

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

also known as dlsrpn

Technical Details

what runs on :2065

DLSw encapsulates LLC-based data-link traffic, including SNA and NetBIOS, between DLSw peers. Implementations commonly establish a peer session over TCP port 2065 and exchange control and encapsulated-frame traffic over that connection; the IANA assignment also covers UDP, although UDP support and its exact use vary by implementation. The protocol is legacy and vendor-dependent, and the "read" designation is part of the historical port naming rather than an indication of a general-purpose file or socket read service.

Security Information

exposure of :2065

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 2.7 across 1,450 ports — this one sits 2.3 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

DLSw should not normally be exposed to the public Internet. It can provide a path into bridged legacy networks and carries traffic without encryption by default; an attacker who can establish or interfere with a peer session may obtain access to encapsulated network traffic or cause denial of service. Restrict the port to configured peer addresses and protect it with network-layer controls or a secure tunnel.

Record

iana registry entry

port: :2065
service: Data Link Switch Read Port Number
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 5/10caution
category: Network Services
usage: This port is used by DLSw peers, especially Cisco routers and other legacy SNA networking equipment, to connect data-link networks across an IP network. It is uncommon on modern Internet-facing hosts and is normally seen only between explicitly configured enterprise network peers.
lookups: 0rank 993
added: 2026-08-23
updated: 2026-09-22
references: IANA service name registry — port 2065

Something wrong?

This record is maintained by the engineers who use port 2065. 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 1,450 in network services →

the 8 most looked-up other ports in network services — 1,450 ports carry that label.

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:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
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: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 :2065Data Link Switch Read Port Number

Technical Details

Security Information

Related Ports

Port 2065Data Link Switch Read Port Number