CyberHunter
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// Other services

Port 1257: Shockwave 2

Port 1257 is assigned by IANA to shockwave2 (Shockwave 2).

1257

How shockwave2 works

Other services
client:1257shockwave2response client:1257shockwave2response

The client sends a request to port 1257 and the shockwave2 service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 1257 dangerous?

We have no specific security note for port 1257. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 1257

ServicePortTransportDescriptionReferenceUpdated
shockwave2 1257 TCP, UDP Shockwave 2 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1257, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1257'      # process listening on 1257
sudo lsof -nP -i :1257

macOS

sudo lsof -nP -i :1257

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1257 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1257
netstat -ano | findstr :1257

From another machine

nmap -p 1257 -sV <host>
sudo nmap -sU -p 1257 <host>
nc -zv <host> 1257

Block it in the firewall

sudo ufw deny 1257/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1257" -Direction Inbound -LocalPort 1257 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1257 used for?

Port 1257 is assigned by IANA to shockwave2 (Shockwave 2).

Is port 1257 TCP or UDP?

Port 1257 is registered for TCP and UDP.

Is it safe to open port 1257?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 1257 is open?

On Linux run "ss -ltnup 'sport = :1257'", on macOS "lsof -nP -i :1257", and on Windows "netstat -ano | findstr :1257" to see the local process. From another machine, "nmap -p 1257 <host>" shows whether it is reachable.

05 Related
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