Port 3750CBOS/IP Encapsulation
TCP and UDP port 3750 is assigned to the obscure CBOS/IP encapsulation service.
- 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 4,884 · top 20%
also known as cbos-ip-port
Technical Details
what runs on :3750CBOS/IP Encapsulation is registered on port :3750 over tcp and udp to Thomas Dannemiller, assigned April 2003. 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 :3750
# linux
sudo ss -tulpn 'sport = :3750'
# macos / bsd
sudo lsof -nP -i :3750
# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :3750nmap -sV -p T:3750 <host>
sudo nmap -sU -sV -p U:3750 <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 :3750risk 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 :3750 yet
known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.
Related Ports
ports registered around :3750, by lookups.
| port | service | risk | |||
|---|---|---|---|---|---|
| :3702 | WS-Discovery | TCPUDP | Network Services | caution | 16.5k |
| :3724 | Club Penguin | TCP | Gaming | caution | 10.4k |
| :3724 | World of Warcraft | TCPUDP | Network Services | caution | 10.2k |
| :3723 | Battle.net Gaming | TCPUDP | Network Services | caution | 9.2k |
| :3689 | DAAP (iTunes Music Sharing) | TCP | Streaming | caution | 9.2k |
| :3690 | Subversion (SVN) | TCPUDP | File Transfer | caution | 5.4k |
| :3784 | Ventrilo | TCPUDP | Gaming | caution | 4.9k |
| :3800 | HGG Application Port | TCP | Network Services | caution | 4.8k |
risk mix of the 8 listed
- caution100%
0 of 8 encrypted