Port 4598A16 (AN-AN)

TCP/UDP 4598 is assigned to A16 (AN-AN), registered to David Ott; no established public deployment is known.

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

Technical Details

what runs on :4598

A16 (AN-AN) is registered on port :4598 over tcp and udp to David Ott, assigned December 2005. 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 :4598

this machine

# linux
sudo ss -tulpn 'sport = :4598'

# macos / bsd
sudo lsof -nP -i :4598

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :4598

another host

nmap -sV -p T:4598 <host>
sudo nmap -sU -sV -p U:4598 <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 :4598

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 :4598 yet

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

Record

iana registry entry

port: :4598
service: A16 (AN-AN)
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: The registry assigns this port to A16 (AN-AN) and names David Ott as the registrant. Its practical use is not established; it has not appeared open in the cited internet-wide scan data.
lookups: 0rank 993
added: 2026-10-05
updated: 2026-10-05
references: IANA service name registry — port 4598

Something wrong?

This record is maintained by the engineers who use port 4598. 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 2026-10-05.

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 :4598, by lookups.

port	service	proto	category	risk	views
:4567	Sinatra Dev HTTP Port	TCP	Web Services	caution	23.0k
:4610	QualiSystems TestShell	TCP	Network Services	caution	10.8k
:4534	Armagetron Advanced	UDP	Gaming	caution	9.4k
:4662	OrbitNet Message	TCPUDP	File Transfer	caution	9.0k
:4569	IAX2	UDP	Voice and Chat	caution	8.0k
:4662	eMule File Sharing	TCP	File Transfer	caution	6.0k
:4593	IPT (ANRI-ANRI)	TCPUDP	—	safe	0
:4536	Event Heap Server SSL	TCPUDPtls	Network Services	safe	0

risk mix of the 8 listed

safe25%
caution75%

1 of 8 encrypted

Port :4598A16 (AN-AN)

Technical Details

Security Information

Related Ports

Port 4598A16 (AN-AN)