Port 577vnas

IANA assigns TCP and UDP port 577 to vnas, but provides no protocol or ownership details.

Technical Details

what runs on :577

vnas is registered on port :577 over tcp and udp. 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 :577

this machine

# linux
sudo ss -tulpn 'sport = :577'

# macos / bsd
sudo lsof -nP -i :577

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :577

another host

nmap -sV -p T:577 <host>
sudo nmap -sU -sV -p U:577 <host>

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

exposure of :577

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 :577 yet

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

ports registered around :577, 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
:623	ASF-RMCP	UDP	Remote Access	caution	20.5k
:563	NNTPS	TCPUDPtls	Web Services	safe	18.1k
:546	DHCPv6 Client	TCPUDP	Network Services	caution	16.6k
:636	LDAPS	TCPUDPtls	Security	caution	15.6k
:547	DHCPv6 Server	TCPUDP	Network Services	caution	14.5k

risk mix of the 8 listed

2 of 8 encrypted