Port 403DECAP
DECAP is assigned to TCP and UDP port 403.
- 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 4,849 · top 20%
Technical Details
what runs on :403DECAP is registered on port :403 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 sometimes. What's listening is often not the registered service, so check before you assume.
find what's listening on :403
# linux
sudo ss -tulpn 'sport = :403'
# macos / bsd
sudo lsof -nP -i :403
# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :403nmap -sV -p T:403 <host>
sudo nmap -sU -sV -p U:403 <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 :403risk 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 :403 yet
known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.
Related Ports
ports registered around :403, by lookups.
| port | service | risk | |||
|---|---|---|---|---|---|
| :443 | HTTPS | TCPtls | Web Services | caution | 65.9k |
| :445 | Microsoft-DS / SMB | TCP | File Transfer | caution | 22.3k |
| :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 |
| :369 | RPC2 Port Mapper | TCPUDP | Network Services | caution | 11.1k |
| :464 | Kerberos Password Change | TCPUDP | Security | safe | 10.6k |
| :465 | SMTP over SSL | TCPtls | caution | 10.4k |
risk mix of the 8 listed
- safe13%
- caution88%
2 of 8 encrypted