Port 5503fcp-srvr-inst2
An obscure service assignment for fcp-srvr-inst2; no widely deployed listener is documented.
- transport
- tcp · udp
- in transit
- cleartext
- assignment
- official
- risk
- 1/10
- lookups
- 0
2 transports registered
payload readable on path
registered with iana
safe
rank 993 of 5,499 · top 18%
Technical Details
what runs on :5503fcp-srvr-inst2 is registered on port :5503 over tcp and udp to Ken Wittmer. 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 :5503
# linux
sudo ss -tulpn 'sport = :5503'
# macos / bsd
sudo lsof -nP -i :5503
# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :5503nmap -sV -p T:5503 <host>
sudo nmap -sU -sV -p U:5503 <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 :5503risk 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 :5503 yet
known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.
Related Ports
ports registered around :5503, by lookups.
| port | service | risk | |||
|---|---|---|---|---|---|
| :5555 | Freeciv | TCP | Security | caution | 26.9k |
| :5495 | Applix TM1 Admin | TCP | Databases | caution | 24.8k |
| :5500 | VNC Viewer Listener | TCP | Remote Access | caution | 15.1k |
| :5450 | OSIsoft PI System Client | TCP | Databases | caution | 14.3k |
| :5498 | Hotline Tracker Server | TCP | File Transfer | caution | 8.4k |
| :5550 | HP Data Protector | TCP | File Transfer | caution | 8.2k |
| :5517 | Setiqueue Proxy | TCPtls | Cloud | caution | 8.0k |
| :5501 | Hotline File Transfer | TCP | File Transfer | caution | 7.8k |
risk mix of the 8 listed
- caution100%
1 of 8 encrypted