Port 437comscm

IANA-assigned comscm service on TCP/UDP 437; protocol and product details are not documented.

Technical Details

what runs on :437

comscm is registered on port :437 over tcp and udp to Jim Teague. 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 :437

this machine

# linux
sudo ss -tulpn 'sport = :437'

# macos / bsd
sudo lsof -nP -i :437

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :437

another host

nmap -sV -p T:437 <host>
sudo nmap -sU -sV -p U:437 <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 :437

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 :437 yet

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

ports registered around :437, by lookups.

port	service	proto	category	risk	views
:443	HTTPS	TCPtls	Web Services	caution	65.9k
:445	Microsoft-DS / SMB	TCP	File Transfer	caution	22.3k
:475	tcpnethaspsrv	TCP	Security	caution	20.7k
:427	Service Location Protocol	TCPUDP	Network Services	caution	14.6k
:384	Remote Server System	TCPUDP	Remote Access	caution	11.5k
:383	HP Data Alarm Manager	TCPUDP	Network Services	caution	11.1k
:464	Kerberos Password Change	TCPUDP	Security	safe	10.6k
:465	SMTP over SSL	TCPtls	Email	caution	10.4k

risk mix of the 8 listed

2 of 8 encrypted