Port 12121NuPaper Session Service
NuPaper Session Service uses TCP and UDP port 12121.
- 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 5,154 · top 19%
also known as nupaper-ss
Technical Details
what runs on :12121NuPaper Session Service is registered on port :12121 over tcp and udp to David Warden 2, assigned November 2005. 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 :12121
# linux
sudo ss -tulpn 'sport = :12121'
# macos / bsd
sudo lsof -nP -i :12121
# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :12121nmap -sV -p T:12121 <host>
sudo nmap -sU -sV -p U:12121 <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 :12121risk 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 :12121 yet
known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.
Related Ports
no neighbours mapped to :12121 yet
ports are related through the categories they share — file this one under a category and its neighbours appear here.