Port 545appleqtcsrvr

An obscure TCP/UDP service assignment for appleqtcsrvr, rarely observed on the public internet.

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

1 other service is registered on port 545. compare all 2 →

Technical Details

what runs on :545

appleqtcsrvr is registered on port :545 over tcp and udp to Murali Ranganathan. 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 :545

this machine

# linux
sudo ss -tulpn 'sport = :545'

# macos / bsd
sudo lsof -nP -i :545

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :545

another host

nmap -sV -p T:545 <host>
sudo nmap -sU -sV -p U:545 <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 :545

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 :545 yet

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

Record

iana registry entry

port: :545
service: appleqtcsrvr
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: IANA assigns the name appleqtcsrvr to both TCP port 545 and UDP port 545. The assignment is registered to Murali Ranganathan; internet-wide scans observe it only rarely.
lookups: 0rank 993
added: 2026-08-28
updated: 2026-08-28
references: IANA service name registry — port 545

Something wrong?

This record is maintained by the engineers who use port 545. 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 2026-08-28.

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 :545, by lookups.

port	service	proto	category	risk	views
:548	Apple Filing Protocol	TCP	File Transfer	caution	36.8k
:593	HTTP RPC Endpoint Mapper	TCPUDP	Network Services	caution	26.0k
:591	FileMaker Web Sharing	TCP	Web Services	caution	23.1k
:502	Modbus Protocol	TCPUDP	Network Services	caution	19.2k
:563	NNTPS	TCPUDPtls	Web Services	safe	18.1k
:546	DHCPv6 Client	TCPUDP	Network Services	caution	16.6k
:547	DHCPv6 Server	TCPUDP	Network Services	caution	14.5k
:533	Netwall Emergency Broadcasts	UDP	Security	caution	14.3k

risk mix of the 8 listed

safe13%
caution88%

1 of 8 encrypted

Port :545appleqtcsrvr

Technical Details

Security Information

Related Ports

Port 545appleqtcsrvr