Port 21849NetSpeak Corp. Credit Processing System

IANA assigns TCP and UDP port 21849 to NetSpeak Corp.'s Credit Processing System; no established common use is known.

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

also known as netspeak-cps

Technical Details

what runs on :21849

NetSpeak Corp. Credit Processing System is registered on port :21849 over tcp and udp to Toby Hosterman. 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 never observed open, so if it's open on your network it's more likely a custom or misconfigured service than the registered one.

find what's listening on :21849

this machine

# linux
sudo ss -tulpn 'sport = :21849'

# macos / bsd
sudo lsof -nP -i :21849

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :21849

another host

nmap -sV -p T:21849 <host>
sudo nmap -sU -sV -p U:21849 <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 :21849

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 :21849 yet

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

Record

iana registry entry

port: :21849
service: NetSpeak Corp. Credit Processing System
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: The IANA registry identifies this assignment as NetSpeak Corp. Credit Processing System and lists Toby Hosterman as the registrant. It has never been observed open in Nmap's scan data, and no common deployment is established.
lookups: 0rank 993
added: 2026-10-18
updated: 2026-10-18
references: IANA service name registry — port 21849

Something wrong?

This record is maintained by the engineers who use port 21849. 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

browse categories →

ports registered around :21849, by lookups.

port	service	proto	category	risk
:21800	TVNC Pro Multiplexing	TCPUDP	—	safe
:21847	NetSpeak Corp. Connection Services	TCPUDP	—	safe
:21801	Safe AutoLogon	TCP	—	safe
:21845	webphone	TCPUDP	—	safe
:21846	NetSpeak Directory Services	TCPUDP	Network Services	safe
:21848	NetSpeak Automatic Call Distribution	TCPUDP	Voice and Chat	safe

risk mix of the 6 listed

safe100%

0 of 6 encrypted

Port :21849NetSpeak Corp. Credit Processing System

Technical Details

Security Information

Related Ports

Port 21849NetSpeak Corp. Credit Processing System