Port 4441Netblox Protocol
UDP port 4441 is assigned to Netblox Protocol, a little-documented service registered by Brian S Locke.
- transport
- udp
- in transit
- cleartext
- assignment
- official
- risk
- 1/10
- lookups
- 0
single transport
payload readable on path
registered with iana
safe
rank 993 of 5,186 · top 19%
Technical Details
what runs on :4441Netblox Protocol is registered on port :4441 over udp to Brian S Locke, assigned July 2008. 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 :4441
# linux
sudo ss -ulpn 'sport = :4441'
# macos / bsd
sudo lsof -nP -i :4441
# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :4441sudo nmap -sU -sV -p U:4441 <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 detailsSecurity Information
exposure of :4441risk 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
udp
udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite
security overview
no security notes recorded for :4441 yet
known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.
Related Ports
ports registered around :4441, by lookups.
| port | service | risk | |||
|---|---|---|---|---|---|
| :4500 | IPSec NAT Traversal | UDPtls | Security | caution | 15.8k |
| :4433 | Axence nVision | TCP | Security | caution | 8.9k |
| :4449 | PrivateWire | TCPUDP | — | safe | 0 |
| :4378 | Cambridge Pixel SPx Display | TCPUDP | — | safe | 0 |
| :4404 | Asigra DS-System Monitoring/Management | TCPUDP | System | safe | 0 |
| :4447 | N1-RMGMT | TCPUDP | — | safe | 0 |
| :4443 | Pharos | TCPUDP | — | safe | 0 |
| :4444 | Kerberos 524 | TCPUDP | Security | caution | 0 |
risk mix of the 8 listed
- safe63%
- caution38%
1 of 8 encrypted