Port 2641HDL Server

HDL Server traffic is assigned to TCP and UDP port 2641.

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

also known as hdl-srv

Technical Details

what runs on :2641

HDL Server is registered on port :2641 over tcp and udp to David Ely. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is found open rarely. What's listening is often not the registered service, so check before you assume.

find what's listening on :2641

this machine

# linux
sudo ss -tulpn 'sport = :2641'

# macos / bsd
sudo lsof -nP -i :2641

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :2641

another host

nmap -sV -p T:2641 <host>
sudo nmap -sU -sV -p U:2641 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :2641

risk score

1/ 10safe

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

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 :2641 yet

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

Record

iana registry entry

port: :2641
service: HDL Server
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: The IANA registry identifies TCP and UDP port 2641 as the HDL Server service. The assignment is registered to David Ely, but no product, protocol documentation, or deployment context is recorded.
lookups: 0rank 993
added: 2026-09-03
updated: 2026-09-03
references: IANA service name registry — port 2641

Something wrong?

This record is maintained by the engineers who use port 2641. 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 2026-09-03.

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

browse categories →

ports registered around :2641, by lookups.

port	service	proto	category	risk	views
:2598	Citrix ICA Session Reliability	TCP	Remote Access	caution	11.0k
:2700	KnowShowGo P2P	TCP	File Transfer	caution	9.9k
:2593	RunUO Ultima Online	TCPUDP	Gaming	caution	9.2k
:2599	SonicWALL Antispam	TCP	Email	caution	8.8k
:2638	Sybase Listener	TCP	Databases	caution	7.8k
:2610	Dark Ages	TCP	Network Services	caution	5.0k
:2612	QPasa	TCPUDP	Network Services	caution	4.6k
:2704	SMS remote control	TCPUDP	Remote Access	safe	0

risk mix of the 8 listed

safe13%
caution88%

0 of 8 encrypted

Port :2641HDL Server

Technical Details

Security Information

Related Ports

Port 2641HDL Server